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Wiki Largest gaps between Superchargers on US Interstates

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ItsNotAboutTheMoney

Well-Known Member
Jul 12, 2012
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15,273
Maine
On the Socorro, NM thread @PLUS EV asked if I had a list of gaps 140 miles or greater.

Of course I do!
I posted there, but I figured I'd create a separate thread for it.

MAJOR EDIT:
Reorganized to::
1) Top 25 regular gaps not yet split
2) Gaps on "Future Interstates" or current fastest route between open segments
3) Open Splitters

MAJOR EDIT:
1) Top table shows all remaining gaps on current Interstates. (46 at time of edit)./

SeqHwyFromStateToStateGapSplitterStateToFromNote
1I-40Oklahoma City - NE 36th StOKVan BurenAR187.9findus Henryetta, OK 2024
2I-55SouthavenMSMinerMO156.2Memphis - S Highland StTN16.6149.2
3I-40KingmanAZFlagstaffAZ147
4I-44Start (US-277/US-281/US-287 Wichita FallsTX)Oklahoma City - NE 36th StOK144.3Wichita FallsTX2.11432024Q1 Vote Lawton, OK!
5I-40Start (I-15 BarstowCA)NeedlesCA141
6I-94Start (I-90 near LockwoodMT)Miles CityMT137.3
7I-10WillcoxAZDemingNM134LordsburgNM73.960.8
8I-90MitchellSDWorthingtonMN126.9Diversion: Sioux Falls, SD 14.3/17.5
9I-84WBoiseIDTwin FallsID126.5findus Mountain Home, ID 2024
10I-29St. JosephMOCouncil BluffsIA125.8
11I-35LaredoTXNataliaTX125.5
12I-80WinnemuccaNVElkoNV125.1CarlinNV104.520.9+findus Carlin, NV Q1 2024
13I-25Las VegasNMTrinidadCO124.2Wagon MoundNM40.584also Raton, NM
14I-90Billings - N Frontage RdMTSheridanWY123.8
15I-70RichfieldUTGreen RiverUT123.2
16I-64LexingtonKYHuntingtonWV121.5
17I-69IndianapolisINFort Wayne - Illinois RdIN121.12024Q1 Vote Gas City, IN!
18I-10Van Horn - W Broadway StTXFort StocktonTX120.7
19I-75Bay CityMIGaylordMI120.5
20I-25EvansvilleWYEnd (I-90 near BuffaloWY)119.3
21I-15Great FallsMTEnd (Canada @ Sweet GrassMT)118.82024Q1 Vote Shelby, MT!
22I-90MissoulaMTButte - Grizzly TrlMT117.8
23I-15Beaver - 525 WUTNephi - S Main StUT114.7ScipioUT80.434.9
24I-40Albuquerque - Louisiana Blvd NENMSanta RosaNM114.5EncinoNM72.242.9Encio NM NEVI 1/2024
25I-55PearlMSGrenadaMS114.3
26I-80Rock SpringsWYRawlinsWY114
27I-64HaubstadtINLouisvilleKY112.6
28I-86ESalamancaNYErwinNY110
29I-84WBurleyIDTremontonUT109.6
30I-70LimonCOGoodlandKS108
31I-39Madison - E Washington AveWIStevens PointWI107.6
31I-15LimaMTButte - Grizzly TrlMT107.6
33I-10Fort StocktonTXOzonaTX107.3
34I-40TucumcariNMAmarilloTX106
35I-44SpringfieldMORollaMO105.8Springfield - N Mulroy RdMO5.3100.9
36I-75West Chester TownshipOHLimaOH103.7Diversion Dayton, OH 11/16
37I-10El Paso - Eastlake BlvdTXVan Horn - W Broadway StTX103.6
38I-81HarrisburgPAWilkes-Barre TownshipPA103.2
39I-20LindaleTXShreveportLA103TylerTX19.584.4
40I-29Sioux FallsSDWatertownSD102.6
41I-25WheatlandWYEvansvilleWY102.2
42I-8La MesaCAEl Centro - Wake AveCA102
42I-90SheridanWYGilletteWY102
42I-94BismarckNDJamestownND102
45I-10IndioCAEhrenbergAZ101.4
46I-80CheyenneWYSidneyNE100.9

Future:
1I-49TexarkanaTXLowellAR250.3Future
2I-69SouthavenMSKuttawaKY202.7Union CityTN125.477.3
3I-69WStart (Laredo at MexicoTX)VictoriaTX184Future
4I-74West CincinnatiOHHuntingtonWV158.7Future Not
5I-11WickenburgAZKingman - W Andy DevineAZ130.5Future; Wikieup, AZ 2024
6I-69EBrownsvilleTXKingsvilleTX116.1Future
7I-69CStart (PharrTX)AliceTX109FalfurriasTX71.737.8Future
8I-11Las Vegas - W Tropical PkwyNVBeattyNV107.4
36I-69EKingsvilleTXEnd (US-59 VictoriaTX)105.2Future
10I-11Casa GrandeAZBuckeyeAZ103.9Future
11I-69EKingsville - E Corral AveTXEnd (US-59 VictoriaTX)102.9RefugioTX67.835.2Future
12I-69CarthageTXTexarkanaTX101.8Future Not

Open:
SeqHwyFromStateToStateGapSplitterStateToFromNote
I-69BrinkleyARKuttawaKY280.1SouthavenMS84.1203.7Future Not
0I-44Start (Wichita FallsTX)CatoosaOK255.6TulsaOK5.7248.5
0I-26AshevilleNCNorth CharlestonSC253.8Asheville - Thetford StNC5.7248.5
0I-26Asheville - Thetford StNCNorth CharlestonSC248.5OrangeburgSC180.469
0I-44Start (Wichita FallsTX)TulsaOK242.1Oklahoma City - NE 36th StOK144.399.8
2I-29Sioux FallsSDFargoND241.6WatertownSD102.6143.1
2I-55GrenadaMSMinerMO239.4SouthavenMS84156.2Diversion: Memphis, TN 23/27
2I-69KuttawaKYBloomingtonIN212HaubstadtIN108.9103.5
2I-64Mount VernonILLouisvilleKY195.1HaubstadtIN81.4112.6
0I-40Oklahoma CityOKVan BurenAR194.3Oklahoma City - NE 36th StOK14.5187.9
2I-40OzarkARBrinkleyAR181.6ConwayAR95.188.1
4I-26Asheville - Thetford StNCOrangeburgSC180.4Columbia - Harbison BlvdSC138.342.9
4I-35LaredoTXSchertzTX173.5NataliaTX125.548.6
4I-35ArdmoreOKPerryOK155.4Oklahoma City - NE 36th StOK99.457.9Diversion: Oklahoma City, OK 19.8/27.5
5I-69NacogdochesTXTexarkanaTX151.2CarthageTX49.6101.8Future Not
7I-25Truth or ConsequencesNMAlbuquerqueNM150.2SocorroNM138.342.9
7I-69CStart (PharrTX)End (George WestTX)149.5AliceTX108.841.1Future and current
7I-69Houston - W Alabama StTXNacogdochesTX148.5LivingstonTX7871.8Future
7I-49JoplinMOEnd (I-435 near Kansas CityMO)148.3NevadaMO41.482.2
8I-40GallupNMAlbuquerqueNM145.8MilanNM63.482.9
8I-59MeridianMSBirminghamAL144.8CottondaleAL96.649.2
8I-20MeridianMSBirminghamAL144.8CottondaleAL96.649.2
8I-29WatertownSDFargoND143.1SissetonSD57.988.8
9I-5Grants PassORSpringfield - Kruse WayOR138.4Myrtle CreekOR46.992.4
9I-26Asheville - Thetford StNCColumbia - Harbison BlvdSC138.3SpartanburgSC56.584
10I-90BillingsMTSheridanWY136.2Billings - N Frontage RdMT13.1123.8
10I-84WThe DallesORPendletonOR134BoardmanOR81.852.4
11I-95AugustaMEMedwayME133.1WatervilleME19.1114.4
11I-55MinerMOMehlvilleMO132Cape GirardeauMO33.198.8
11I-55TexarkanaTXLittle RockAR131.9HopeAR32.499.8
6I-69TexarkanaTXLittle RockAR131.9HopeAR32.499.8Future Not
11I-25TrinidadCOColorado SpringsCO131.7PuebloCO88.144.6
11I-39Madison - E Washington AveWIEnd (US51/WI29 near WausauWI)131.7Stevens PointWI107.626.7
9I-10El PasoTXVan Horn - W Broadway StTX130.8El Paso - Eastlake BlvdTX28103.3
12I-65GreenvilleALMountain BrookAL130.4Montgomery - Mobile HwyAL37.993.6
12I-76ECarlislePAEnd (I-295 near CamdenNJ)130DenverPA66.140.2
12I-22TupeloMSBirminghamAL129.3GuinAL60.569.9
12I-77Charlotte - Northlake Centre PkwyNCWythevilleVA129MooresvilleNC19.2112.7
12I-11Start (NogalesAZ)Casa GrandeAZ129Tucson - W River RdAZ73.956.2
8I-69HumbleTXNacogdochesTX128.9LivingstoneTX58.471.8Future
12I-74ArchdaleNCEnd (NC41 at LumbertonNC)128.8RockinghamNC75.249.9
12I-65MobileALGreenvilleAL128.3EvergreenAL94.234.7
12I-10ChannelviewTXLake CharlesLA127.6BaytownTX9118.8
12I-69IndianapolisINFort WayneIN127.3Fort Wayne - Illinois RdIN121.17.3
14I-40CaryNCWallaceNC126GarnerNC34.953.3
14I-43Start (I-39 near BeloitWI)SheboyganWI125.8GlendaleWI7749.4
16I-27Start (US-87 LubbockTX)End (I-40/US-60/US-87 AmarilloTX)124.3PlainviewTX49.474.9
16I-64Mt. HopeWVLexingtonVA124.2LewisburgWV5471.3
16I-90MissoulaMTButteMT123.5Butte - Grizzly TrlMT117.86
20I-20LithoniaGAAugusta - Belair Frontage RdGA123MadisonGA44.180
20I-75CincinnatiOHLimaOH122.6West Chester TownshipOH22103.7Diversion Dayton, OH 11/16
20I-15Las Vegas - Grand Central ParkwayNVSt. GeorgeUT121.9MesquiteNV80.142.9
20I-77CambridgeOHEnd (I-90 at ClevelandOH)121.8New PhiladelphiaOH39.782.9
20I-49AlexandriaLAShreveportLA121.3NatchitochesLA53.968.5
21I-90SheffieldOHEriePA120.9Cleveland - Euclid AveOH27.394.8
23I-20CiscoTXArlington - E Bardin RdTX120.2SantoTX56.964
24I-57MinerMOMount VernonIL119.8MarionIL78.941.9
26I-10BaytownTXLake CharlesLA118.7Beaumont - Walden RdTX57.461.9
26I-11Las Vegas - Bridger AveNVBeattyNV118.7Las Vegas - W Tropical PkwyNV14.3107.4Future
26I-20MonroeLAPearlMS118.4VicksburgMS71.248.8
29I-40Knoxville - Brookview Centre WayTNAshevilleNC117.4SeviervilleTN25.793.2
29I-40AlbuquerqueNMSanta RosaNM116.8Albuquerque - Louisiana Blvd NENM3.7114.5
30I-88WStart (I-80 near MolineIL)North AuroraIL116RochelleIL77.740.9
30I-85BufordGAGreenvilleSC115.9Fair PlaySC69.147
30I-64Start (I-70 at WentzvilleMO)Mount VernonIL115.5BrentwoodMO31.784.8
25I-81HarrisburgPAMoosicPA115.2Wilkes-Barre TownshipPA103.214.5
34I-74ChampaignILSpeedwayIN114.4VeedersburgIN56.959.4
26I-95WatervilleMEMedwayME114.4Bangor - BroadwayME56.159.8Diversion: Brewer, ME 10.7/14.5
30I-65LouisvilleKYIndianapolis - E Southport RdIN114ColumbusIN74.140.3
37I-80Chicago - O’HareILMishawakaIN113.7Rolling Prairie - S Knute Rockne PlazaIN88.225.5
37I-20MidlandTXSweetwaterTX113.5Big SpringTX48.865.5
29I-15LimaMTButteMT113.3Butte - Grizzly TrlMT107.66
39I-77MooresvilleNCWythevilleVA112.7Mt Airy - Graceland LnNC66.747.4
27I-76EStart (I-71 near Westfield CenterOH)Cranberry Township - US 19PA112.7New Springfield - Glacier Hills Service PlazaOH79.133.4
40I-70IndependenceMOColumbia - W BroadwayMO111.9ConcordiaMO44.767.7
40I-10SlidellLAMobileAL111.2D'IbervilleMS57.155.8
41I-91West LebanonNHEnd (Canada @ Derby LineNH)109.7St. JohnsburyVT65.945.8
41I-35OlatheKSBethanyMO109.6LibertyMO33.876.7
42I-44RollaMOEnd (I-70 St LouisMO)109.3St. LouisMO103.56.4
42I-90Coeur d'AleneIDSuperiorMT109.3St. RegisMT95.913.9
42I-94FargoNDAlexandriaMN109.1Fergus FallsMN59.949.8
42I-75TiftonGAMacon - Tom Hill Sr RdGA109CordeleGA40.570.4
42I-69KuttawaKYHaubstadtIN108.9EvansvilleIN100.713.8
42I-24KuttawaKYNashvilleTN108.5Nashville - 11th Ave NTN1047.6
42I-55NormalILBolingbrookIL108DwightIL53.755
44I-10MobileALCrestviewFL107.4RobertsdaleAL34.274
47I-65Bowling GreenKYLouisville - Preston HwyKY105.9ElizabethtownKY70.136.5
47I-70ColbyKSHaysKS105.9OakleyKS22.583.9findus Russell, KS Q1 2023
49I-85GreenvilleSCCharlotteNC105.1GastoniaNC78.828.2
49I-80MaumeeOHStrongsvilleOH105Genoa - Wyandot Service PlazaOH18.786.8
49I-70SalinaKSTopekaKS104.5AbileneKS23.581.7
49I-20ShreveportLAMonroeLA104.4RustonLA70.334.6
44I-24KuttawaKYNashville - 11th Ave NTN104Nashville - Dickerson PikeTN99.97.2
52I-69HaubstadtINBloomingtonIN103.5WashingtonIN47.757.7
52I-44RollaMOSt. LouisMO103.5FentonMO90.514.1
38I-10San AntonioTXFlatoniaTX103.2LulingTX73.230.4
53I-16Start (I-75 at MaconGA)MetterGA103.1DublinGA50.653.2
54I-94Eau ClaireWIMaustonWI102.7TomahWI74.529
54I-35Albert Lea - Happy Trails LaneMNOakdaleMN102.6EaganMN83.620.8
56I-80GothenburgNEGrand IslandNE102KearneyNE62.441.9
60I-20ArlingtonTXLindaleTX101Dallas - S Riverfront BlvdTX16.888.7
61I-69VictoriaTXRichmondTX100.9WhartonTX68.933.2
I-69KuttawaKYEvansvilleIN100.7NortonvilleKY42.662.1

StatusPatheticTotal
Permit49
Construction00
None037

All gaps:
Total 5447.3
Avg 118.4

Top 25 gaps:
Total 25 3232.2
Avg 25 129.3
 
Last edited:
I have driven Mt Vernon to Louisville and return on two trips and the plug to plug mileage the car reports is 199.3 miles. Here’s trip info from Louisville to Mt Vernon from my trip in July.
TjBGyyG.jpg

I wouldn't want to do this in the winter.
 
Last edited:
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I have driven Mt Vernon to Louisville and return on two trips and the plug to plug mileage the car reports is 199.3 miles. Here’s trip info from Louisville to Mt Vernon from my trip in July.
TjBGyyG.jpg

I wouldn't want to do this in the winter.
I should have added a couple more notes: the distances are in the standard Interstate directions: even west to east and odd south to north.
Also, it's according to Supercharge.info which uses Mapbox, using OSM.
 
And then there’s gaps like I84 from the 5 stall v2 charger on the west side of the Dallas OR to the 8 stall v2 charger on the east side of Pendleton that is over 134 miles but through the Columbia gorge which commonly has strong headwinds and cold in the winter.
 
>=100120140150160180200Extra
I-6996433221
I-1083000000
I-4085522200
I-2072100000
I-9064000000
I-2553110000
I-6452111101
I-8051000000

The Extra refers to an extra count in my list for at minimum the >= 100 column, but usually more. This is where an unopened splitter of a large gap still leaves gaps over 100 and I've added entries for the new gaps.
Right now it's just the effect of Haubstadt, IN under construction.
 
On the Socorro, NM thread @PLUS EV asked if I had a list of gaps 140 miles or greater.

Of course I do!

I posted there, but I figured I'd create a separate thread for it.

Note that:
- I've included some gaps that are future Interstate-ish routes like I-69. Those Interstate routes may never be built, but since they're identified it makes sense they have traffic and need Superchargers, right?
- I don't tolerate much diversion, so for example I-35 from Ardmore to Perry, OK is listed because Oklahoma City, OK is over 10 miles diversion and I-55 is listed because of the relic of Tesla's location desperation, Memphis, TN.
- I ignore urban Superchargers.
- Only a few of gaps listed have even identified splitter locations. Haubstadt, IN and Nevada, MO are under construction. Socorro, NM is identified.
- Watertown, SD to Fargo, ND is listed, and Watertown, SD fairly recently split a larger gap on I-29 from Sioux Falls, SD to Fargo, ND.
-Meridian, MS to Birmingham, AL is on an I-20/I-59 concurrency so listed twice

SeqHwyFromStateToStateGapSplitterStateToFrom
1I-69BrinkleyARKuttawaKY280.1
2I-44Start (US-277/281/287 Wichita Falls)TXCatoosaOK255
3I-26AshevilleNCNorth CharlestonSC253.8
4I-49TexarkanaTXLowellAR250.3
5I-55GrenadaMSMinerMO239.4
6I-69KuttawaKYBloomingtonIN212HaubstadtIN108.9103.5
7I-64Mount VernonILLouisvilleKY195.1HaubstadtIN81.4112.6
8I-40Oklahoma CityOKVan BurenAR194.3
9I-69WLaredo at MexicoTXVictoriaTX184
10I-40OzarkARBrinkleyAR181.6
11I-35LaredoTXSchertzTX173.1
12I-69RichmondTXNacogdochesTX170
13I-74West CincinnatiOHHuntingtonWV158.7
14I-35ArdmoreOKPerryOK155
15I-25Truth or ConsequencesNMAlbuquerqueNM150.2SocorroNM72.879.1
16I-69CPharrTXGeorge WestTX149
17I-49JoplinMOEnd (I-435 near Kansas CityMO)148.3NevadaMO67.482.2
18I-40KingmanAZFlagstaffAZ147
19I-69NacogdochesTXTexarkanaAR145.9
20I-59MeridianMSBirminghamAL144.8
20I-20MeridianMSBirminghamAL144.8
21I-40GallupNMAlbuquerqueNM144
23I-29WatertownSDFargoND143.1
24I-40Start(BarstowCA)NeedlesCA141

Aside: this is from a worksheet I have that goes down to 100 miles. That list has a total of 122 unsplit gaps. 9 gaps from my original list have been split (including some splits still greater than 100 miles), 8 are under construction and 3 have an identified ("permit") location.
My methodology would be quite a bit more "loose" than yours. I wouldn't count all these "future interstates" and I wouldn't worry so much about the diversions. They are inconvenient, but when you are worrying about ending up on the side of the road vs. diverting 15-20 minutes to an inconveniently located supercharger, the choice is obvious.

So my list would be something like:

1) OKC-Van Buren 194mi
2) Laredo-San Antonio 164mi
3) Sheridan-Evansville* 154mi
4) ABQ-Truth or Consequences 150mi
5) Watertown-Fargo 147mi
6) Kingman-Flagstaff 147mi
7) Gallup-ABQ 145mi
8) Meridian-Birmingham 145mi

Honorable mention goes to Shelby-Fort MacLeod at 215 miles, although obviously a lot of that is in another country.

Sheridan-Evansville is two different interstates, but it's obviously going to be a common route for people in that area.

I didn't bother including Mount Vernon-Louisville because Haubstadt is about to open. I also didn't include Barstow-Needles (which is actually 147 miles) because Yermo is an easy bailout in the uphill direction (which is the only direction that matters) and it cuts the gap to <140 miles.

#2 and #8 are not much of a concern since the climate is favorable and there's no significant elevation change.

#1, #5, and #6 are probably the biggest issues to address.

#1 is really the only one that could be tough to make under certain conditions assuming one is aware of the large gap and actually trying to charge to near full and extend range to the extent possible.
 
My methodology would be quite a bit more "loose" than yours. I wouldn't count all these "future interstates" and I wouldn't worry so much about the diversions. They are inconvenient, but when you are worrying about ending up on the side of the road vs. diverting 15-20 minutes to an inconveniently located supercharger, the choice is obvious.

So my list would be something like:

1) OKC-Van Buren 194mi
2) Laredo-San Antonio 164mi
3) Sheridan-Evansville* 154mi
4) ABQ-Truth or Consequences 150mi
5) Watertown-Fargo 147mi
6) Kingman-Flagstaff 147mi
7) Gallup-ABQ 145mi
8) Meridian-Birmingham 145mi

Honorable mention goes to Shelby-Fort MacLeod at 215 miles, although obviously a lot of that is in another country.

Sheridan-Evansville is two different interstates, but it's obviously going to be a common route for people in that area.

I didn't bother including Mount Vernon-Louisville because Haubstadt is about to open. I also didn't include Barstow-Needles (which is actually 147 miles) because Yermo is an easy bailout in the uphill direction (which is the only direction that matters) and it cuts the gap to <140 miles.

#2 and #8 are not much of a concern since the climate is favorable and there's no significant elevation change.

#1, #5, and #6 are probably the biggest issues to address.

#1 is really the only one that could be tough to make under certain conditions assuming one is aware of the large gap and actually trying to charge to near full and extend range to the extent possible.

While you and other EV drivers might tolerate some large diversions, I'm looking at it more from a sense of completion.

I don't have elevations, so obviously some are a bigger issue than others. But even in favorable conditions the practical problem with some of these larger gaps, especially where 2 larger gaps are connected, is that the stops, can become mandatory, and it becomes a stress point. Really for removing stress you want more some splitting of consecutive 100-mile gaps. Consecutive 100+ gaps is something else to look at.,

.On the Sheridan-Evansville issue, I have gaps for travel between different Interstates on a separate list that I need to update. Not surprising to note that I-26 has some of the larger numbers. :p
 
My methodology would be quite a bit more "loose" than yours. I wouldn't count all these "future interstates" and I wouldn't worry so much about the diversions. They are inconvenient, but when you are worrying about ending up on the side of the road vs. diverting 15-20 minutes to an inconveniently located supercharger, the choice is obvious.

So my list would be something like:

1) OKC-Van Buren 194mi
2) Laredo-San Antonio 164mi
3) Sheridan-Evansville* 154mi
4) ABQ-Truth or Consequences 150mi
5) Watertown-Fargo 147mi
6) Kingman-Flagstaff 147mi
7) Gallup-ABQ 145mi
8) Meridian-Birmingham 145mi

Honorable mention goes to Shelby-Fort MacLeod at 215 miles, although obviously a lot of that is in another country.

Sheridan-Evansville is two different interstates, but it's obviously going to be a common route for people in that area.

I didn't bother including Mount Vernon-Louisville because Haubstadt is about to open. I also didn't include Barstow-Needles (which is actually 147 miles) because Yermo is an easy bailout in the uphill direction (which is the only direction that matters) and it cuts the gap to <140 miles.

#2 and #8 are not much of a concern since the climate is favorable and there's no significant elevation change.

#1, #5, and #6 are probably the biggest issues to address.

#1 is really the only one that could be tough to make under certain conditions assuming one is aware of the large gap and actually trying to charge to near full and extend range to the extent possible.

Don't forget Billings to Miles City, MT. That's 152 miles between superchargers. Technically I-90 to I-94, but that's semantic if you're driving it. :)

Custer, MT, which would split that gap, is now listed as "target Q2 2022" - we'll hope!
 
I'm curious:
1. Is there a reason why this is limited to only Interstates? Maybe that's just because this is very manually calculated, so easier to work with the smaller number of routes.

2. Would it be possible to include the U.S. federal highways, which are still major routes in a lot of places where there are no Interstates?

I ask this because Monday and Tuesday, I drove back from Los Angeles to Boise. That path northward, through California, Nevada, and Oregon is almost all U.S. highways, (395 and 95) where there are no Interstates--about 750 miles of it. Most of that had Supercharger coverage, but the Winnemucca to Boise section still doesn't, which is over 250 miles.
 
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I'm curious:
1. Is there a reason why this is limited to only Interstates? Maybe that's just because this is very manually calculated, so easier to work with the smaller number of routes.

2. Would it be possible to include the U.S. federal highways, which are still major routes in a lot of places where there are no Interstates?

I ask this because Monday and Tuesday, I drove back from Los Angeles to Boise. That path northward, through California, Nevada, and Oregon is almost all U.S. highways, (395 and 95) where there are no Interstates--about 750 miles of it. Most of that had Supercharger coverage, but the Winnemucca to Boise section still doesn't, which is over 250 miles.

I think the list of gaps on US highways would be long. But what the heck, I'll start:

US-2, Spokane, WA to Grand Forks, ND: 1,150 miles.

Can anyone beat that one? :)
 
I think the list of gaps on US highways would be long. But what the heck, I'll start:

US-2, Spokane, WA to Grand Forks, ND: 1,150 miles.

Can anyone beat that one? :)

Hmm ...

I got 1159.3 miles following US-2 for that.
If Shelby, MT actually gets built it'll split the gaps to 417.5 miles and 741.9 miles.
US-60 Wickenburg, AZ to Miner, MO is 1583.5 miles. Plenty of places in between, but not actually close to that highway. Even once Socorro, NM is open, Socorro, NM to Miner, MO will be 1152.8 miles.
 
I'm curious:
1. Is there a reason why this is limited to only Interstates? Maybe that's just because this is very manually calculated, so easier to work with the smaller number of routes.

2. Would it be possible to include the U.S. federal highways, which are still major routes in a lot of places where there are no Interstates?

I ask this because Monday and Tuesday, I drove back from Los Angeles to Boise. That path northward, through California, Nevada, and Oregon is almost all U.S. highways, (395 and 95) where there are no Interstates--about 750 miles of it. Most of that had Supercharger coverage, but the Winnemucca to Boise section still doesn't, which is over 250 miles.
I have a separate list of spacing along US Numbered Highways and some of those gaps are very long if you're following the highway and don't want significant diversion.

The thing is that in contrast to Interstates, an individual US Numbered Highways is often not the fastest route, so a _faster_ diversion can get you to a Supercharger by an Interstate or other highway.

A useful list of gaps on US Numbered Highways would likely need to be more selective.

Still, my sense of completion means I am tracking along US highways, and it's clear that Tesla is filling in holes along many of those in as well. It's nerd-exciting to me when the largest gap drops below 250 miles, then 200, then 150 and then, sometimes, 100.

And yes, I have a lot of manual processes, and yes I should work more on automating it, but I'm a procrastinator.