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Unscientific roof rack efficiency test (Model 3)

house9

Supporting Member
Nov 16, 2019
373
400
California
Unscientific roof rack efficiency test (Model 3)

Summary:

30.3 mile mixed loop: 2 neighborhood (20 - 35), 12.5 highway/freeway (65 - 80), 16 road (45 - 65)

Stock: 236 Wh/Mile
Tesla Roof Rack: 247 Wh/Mile
Tesla Roof Rack w/Yakima Highroad: 264 Wh/Mile
Tesla Roof Rack w/Yakima Highroad, 2 bikes: 348 Wh/Mile

Details:

1.png

Stock: 236 Wh/Mile
Clear 80.5 F, Wind 8.5
30.29 Driven / 32.95 Rated Miles Used
91.9% Efficiency
Battery Usage: 11% / 7.15 kWh


2.png

Tesla Roof Rack: 247 Wh/Mile
Partly Cloudy 66.4 F, Wind 5.3
30.31 Driven / 34.14 Rated Miles Used
88.8% Efficiency
Battery Usage: 10% / 7.48 kWh


3.png
Tesla Roof Rack w/Yakima Highroad: 264 Wh/Mile
Clear 67.1 F, Wind 10
30.31 Driven / 36.45 Rated Miles Used
83.1% Efficiency
Battery Usage: 12% / 7.99 kWh


4.png

Tesla Roof Rack w/Yakima Highroad, 2 bikes: 348 Wh/Mile
Clear 68.8 F, Wind 7.4
30.32 Driven / 48.12 Rated Miles Used
63% Efficiency
Battery Usage: 16% / 10.5 kWh

IMG_20200717_155114.jpg


Wind Noise:
- Tesla Roof Rack mild increase in wind noise
- Yakima Highroad massive increase in wind noise
- Yakima Highroad with bikes can't tell if there is a difference but the racks alone create a ton

Highroad bike racks are very loud at 65mph+ luckily the stereo system can drown it out
 

bsk997

Member
May 30, 2016
122
39
92887
Very nice experiment.
I just got a roof rack with a couple yakima bike racks and noticed it was a pretty noisy too. It's a pain to take on/off all the time though.
 
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house9

Supporting Member
Nov 16, 2019
373
400
California
Very nice experiment.
I just got a roof rack with a couple yakima bike racks and noticed it was a pretty noisy too. It's a pain to take on/off all the time though.

Yeah, I would probably take them off if I was going on a long trip without bikes.
But if I was going on a long trip I would probably want bikes :)
 
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lolder

Member
Jun 11, 2016
900
693
SW Florida
If there was a rear bicycle rack for a M3 you could put a wedge shaped fairing around it and there would likely be no penalty. That area behind the car is "free" space aerodynamically.
 
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MJP.P3D-

Supporting Member
Apr 18, 2016
647
514
Chicago
Unscientific roof rack efficiency test (Model 3)

Summary:

30.3 mile mixed loop: 2 neighborhood (20 - 35), 12.5 highway/freeway (65 - 80), 16 road (45 - 65)

Stock: 236 Wh/Mile
Tesla Roof Rack: 247 Wh/Mile
Tesla Roof Rack w/Yakima Highroad: 264 Wh/Mile
Tesla Roof Rack w/Yakima Highroad, 2 bikes: 348 Wh/Mile

Details:

View attachment 569263
Stock: 236 Wh/Mile
Clear 80.5 F, Wind 8.5
30.29 Driven / 32.95 Rated Miles Used
91.9% Efficiency
Battery Usage: 11% / 7.15 kWh


View attachment 569266
Tesla Roof Rack: 247 Wh/Mile
Partly Cloudy 66.4 F, Wind 5.3
30.31 Driven / 34.14 Rated Miles Used
88.8% Efficiency
Battery Usage: 10% / 7.48 kWh
Great post — thanks for making the effort to post your results.

View attachment 569265Tesla Roof Rack w/Yakima Highroad: 264 Wh/Mile
Clear 67.1 F, Wind 10
30.31 Driven / 36.45 Rated Miles Used
83.1% Efficiency
Battery Usage: 12% / 7.99 kWh


View attachment 569264
Tesla Roof Rack w/Yakima Highroad, 2 bikes: 348 Wh/Mile
Clear 68.8 F, Wind 7.4
30.32 Driven / 48.12 Rated Miles Used
63% Efficiency
Battery Usage: 16% / 10.5 kWh

View attachment 569268

Wind Noise:
- Tesla Roof Rack mild increase in wind noise
- Yakima Highroad massive increase in wind noise
- Yakima Highroad with bikes can't tell if there is a difference but the racks alone create a ton

Highroad bike racks are very loud at 65mph+ luckily the stereo system can drown it out
 

MJP.P3D-

Supporting Member
Apr 18, 2016
647
514
Chicago
Unscientific roof rack efficiency test (Model 3)

Summary:

30.3 mile mixed loop: 2 neighborhood (20 - 35), 12.5 highway/freeway (65 - 80), 16 road (45 - 65)

Stock: 236 Wh/Mile
Tesla Roof Rack: 247 Wh/Mile
Tesla Roof Rack w/Yakima Highroad: 264 Wh/Mile
Tesla Roof Rack w/Yakima Highroad, 2 bikes: 348 Wh/Mile

Details:

View attachment 569263
Stock: 236 Wh/Mile
Clear 80.5 F, Wind 8.5
30.29 Driven / 32.95 Rated Miles Used
91.9% Efficiency
Battery Usage: 11% / 7.15 kWh


View attachment 569266
Tesla Roof Rack: 247 Wh/Mile
Partly Cloudy 66.4 F, Wind 5.3
30.31 Driven / 34.14 Rated Miles Used
88.8% Efficiency
Battery Usage: 10% / 7.48 kWh


View attachment 569265Tesla Roof Rack w/Yakima Highroad: 264 Wh/Mile
Clear 67.1 F, Wind 10
30.31 Driven / 36.45 Rated Miles Used
83.1% Efficiency
Battery Usage: 12% / 7.99 kWh


View attachment 569264
Tesla Roof Rack w/Yakima Highroad, 2 bikes: 348 Wh/Mile
Clear 68.8 F, Wind 7.4
30.32 Driven / 48.12 Rated Miles Used
63% Efficiency
Battery Usage: 16% / 10.5 kWh

View attachment 569268

Wind Noise:
- Tesla Roof Rack mild increase in wind noise
- Yakima Highroad massive increase in wind noise
- Yakima Highroad with bikes can't tell if there is a difference but the racks alone create a ton

Highroad bike racks are very loud at 65mph+ luckily the stereo system can drown it out

Great post — thanks for making the effort to post your results!
 
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21EV

Member
Mar 11, 2021
41
34
Columbus, OH
That’s about what I saw on my current vehicle with the roof rack installed (-5%) though most of my trips were to local mountain bike trail, 5-15 miles away. Seems manageable. I wonder if a fairing helps.
 

pnwadventures

@bpr1de on Instagram
Mar 3, 2021
126
131
Pacific Northwest
That’s about what I saw on my current vehicle with the roof rack installed (-5%) though most of my trips were to local mountain bike trail, 5-15 miles away. Seems manageable. I wonder if a fairing helps.
Range hits below 10% imo are irrelevant, as it doesn’t result in a meaningful difference in number of charge stops, duration, or expense, especially compared to the benefits of being ready for awesomeness on a moment’s notice.
 
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Reactions: Biscuitman and 21EV

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