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Actual rated wh/mi

Now the bottom line. Unless you charge at work or some other location where someone else pays for the electricity you are probably paying about $5 or a little more for a gallon equivalent (33.7kW) of electricity when you charge at home (Supercharger costs are even higher.) If gas costs you $3.20 per gallon and you achieve (best case) 56 MPG in your Prius your cost per mile (just for gas) is 5.7 cents per mile. The cost per mile of driving the Tesla Model Y would be $5/125MPGe or 4 cents per mile. Many conventional (non-hybrid) internal combustion engine (ICE) vehicles such as trucks and SUVs never get anywhere near 30 MPG let alone 56 MPG, typically not much over 20 MPG. At $3.20 per gallon for gas driving a conventional ICE vehicle that achieves 22 MPG would cost 14.5 cents per mile.
That’s the bottom line for us - we also have a Honda Odyssey. It’s a great car but gets about 20 MPG. At $3.20 per gallon that’s $0.16/mile in fuel costs compared to $0.015 ~ $0.03 per mile for my model Y.
 

CpYledomUser1

2022 MYLR White/White
Aug 1, 2021
18
3
Grapevine TX
Now the bottom line. Unless you charge at work or some other location where someone else pays for the electricity you are probably paying about $5 or a little more for a gallon equivalent (33.7kW) of electricity when you charge at home (Supercharger costs are even higher.) If gas costs you $3.20 per gallon and you achieve (best case) 56 MPG in your Prius your cost per mile (just for gas) is 5.7 cents per mile. The cost per mile of driving the Tesla Model Y would be $5/125MPGe or 4 cents per mile. Many conventional (non-hybrid) internal combustion engine (ICE) vehicles such as trucks and SUVs never get anywhere near 30 MPG let alone 56 MPG, typically not much over 20 MPG. At $3.20 per gallon for gas driving a conventional ICE vehicle that achieves 22 MPG would cost 14.5 cents per mile.
I assume you meant $0.05 not $5? Either way, that’s a lot more efficient than I expected. Thank you all for helping me make sense out of that word salad on my screen!
 

jcanoe

Well-Known Member
Oct 2, 2020
5,327
5,814
Maryland
I assume you meant $0.05 not $5? Either way, that’s a lot more efficient than I expected. Thank you all for helping me make sense out of that word salad on my screen!
The cost of ~34 kWh (the equivalent electricity energy stored in 1 gallon of gas), consuming that amount of electricity can exceed $5 in many places. The cost per individual kWh may be closer to $0.05, probably $0.07 or a bit more per kWh. When you add the power distribution cost to the power generation cost ($0.07) you get a total cost per kWh of $0.15, in many places even more.

A gallon of gas equivalent (in kWh) can be expensive unless you have a solar panel system. If you can travel 4 or 5 times further on the same amount of energy as an ICE vehicle can travel on a gallon of gas you are still way ahead in terms of your cost per mile. $5.00 per gallon equivalent (for electricity) divided by 125 miles = $0.04 per mile for the Tesla Model Y (estimated); $3.20 per gallon for gas divided by 22 miles per gallon = $0.15. The cost per mile of driving the gas vehicle is almost 4 time more.
 
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charlesoris

2022 MYLR Red/White, 19", No FSD no Tow OD:12/13
Dec 11, 2021
247
180
California, USA
The cost of ~34 kWh (the equivalent electricity energy stored in 1 gallon of gas), consuming that amount of electricity can exceed $5 in many places. The cost per individual kWh may be closer to $0.05, probably $0.07 or a bit more per kWh. When you add the power distribution cost to the power generation cost ($0.07) you get a total cost per kWh of $0.15, in many places even more.

A gallon of gas equivalent (in kWh) can be expensive unless you have a solar panel system. If you can travel 4 or 5 times further on the same amount of energy as an ICE vehicle can travel on a gallon of gas you are still way ahead in terms of your cost per mile. $5.00 per gallon equivalent (for electricity) divided by 125 miles = $0.04 per mile for the Tesla Model Y (estimated); $3.20 per gallon for gas divided by 22 miles per gallon = $0.15. The cost per mile of driving the gas vehicle is almost 4 time more.
The unfortunate thing is that the cheapest rate for Southern California Edison EV owners is $15/kWh off-peak plus the usual service fees. Gas is getting close to $5.00 per gallon.
 

.Slug

Member
Nov 8, 2021
82
111
CA
The unfortunate thing is that the cheapest rate for Southern California Edison EV owners is $15/kWh off-peak plus the usual service fees. Gas is getting close to $5.00 per gallon.
Do you mean $0.15/kWh? I'm in So Cal Orange County and Edison charges us $0.22/kWh and $0.32/kWh (we're in tier 2, not Tier 1). Tier 1 costs $0.16/kWhr.
 
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I am having a really hard time relating wh/mi to some sort of efficiency rating. Basically I have no idea if I’m being efficient and by how much. Currently my MY shows an average of 256 wh/mi, it’s a 2022, if that matters. How does that relate to MPG or MPGe?

Off the bat yes 256wh/mi is pretty efficient i’d say over 315wh/mi+(People will argue on this one) is on the low end of efficient on the MY but still can get like 200miles give or take on a full charge


To add on the rest convo of money saved spent etc.

My personal take, my previous 18 accord(2.0 engine) got about 21-24mpg average i filled up at 30-40$ a year ago weekly, it would probably be more nowadays but that was about 120-160$ a month give or take

I charge MY about 1 a week(35-40% to 90%) with an extra charge squeezed in there so lets say 5 times a month i do it at off peak 8 cents(EP Electric) per Kw

Since im just gonna take a wild guess here i never charge the max 77 usable kw of my battery im gonna go on the high end for purposes and say i charge about 50kw but its really usually less look at the pic for reference

0.08cents x 50kw = 4 dollarz
4 dollars x 5 times a month = 20 dollarz a month

Sure u can add gas surcharge and all that garbage on the electric bill that i paid for before the car anyways

Huge savings for me personally

017E64C1-57C6-4973-AF97-2F88F70E48CB.jpeg

75CA2399-976D-4E4B-A468-BE0873BA656A.jpeg
 

charlesoris

2022 MYLR Red/White, 19", No FSD no Tow OD:12/13
Dec 11, 2021
247
180
California, USA
Do you mean $0.15/kWh? I'm in So Cal Orange County and Edison charges us $0.22/kWh and $0.32/kWh (we're in tier 2, not Tier 1). Tier 1 costs $0.16/kWhr.
Yes, I meant $.15. The December rates are Tier 1=$.16, Tier 2=$.23. The TOU-D-Prime from 9:00 PM to 4:00 PM is $.19 and between 4:00 PM to 9:00 PM is $.48. TOU-D-Prime is for EV owners.
 

Madsen203

May 26, MYLR, White ext, Black int, Tow, 19”
Jun 1, 2021
688
486
Bay Area
Yes, I meant $.15. The December rates are Tier 1=$.16, Tier 2=$.23. The TOU-D-Prime from 9:00 PM to 4:00 PM is $.19 and between 4:00 PM to 9:00 PM is $.48. TOU-D-Prime is for EV owners.
The EV rate there is a rip
Off. PGE has a similar plan in Bay Area and if you do your math, you’ll find it’s a much higher annual bill.

To OP I’m averaging just over 300wh/mi but I drive faster than average as it is so effortless. Highway speeds kill me the most. 85-90mph uses like 360-400.
 

MY-Y

Active Member
Mar 4, 2020
1,313
1,559
MD
Depends on the state and implementation. In MD, if you're willing to take the privacy risk, you get the EV rate on only your car's charging energy. You need to give a 3rd party site a Tesla login to do that if you're using the Tesla wall charger (or any charger than the couple they can directly log into). Power is discounted quite a bit off peak. That's 11:00 am to 5:00 pm, and 9:00 pm through 7:00 am in the winter. 8:00 pm to 10:00 am in the summer.

Regular power: $0.0833 + delivery
Summer:
EV peak: $0.13597 + delivery
EV off peak: $0.03752
Winter:
EV peak: $0.14676
EV off peak: $0.04457

Delivery is: $0.04106 on top of those rates.

All of my charging is off peak, so I pay:
Summer: $0.07858/kWh
Winter: $0.08563/kWh
 
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.Slug

Member
Nov 8, 2021
82
111
CA
Yes, I meant $.15. The December rates are Tier 1=$.16, Tier 2=$.23. The TOU-D-Prime from 9:00 PM to 4:00 PM is $.19 and between 4:00 PM to 9:00 PM is $.48. TOU-D-Prime is for EV owners.
Here is an attached screenshot from the SCE website for December billing period. Its actually higher than our November billing period of 0.22 and 0.32/kWhr. I'm sure it depends on your municipality in Orange County. Also, we're not on a TOU plan because we are home a lot during the day/during peak usage fees so it doesn't make sense for us.
 

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Yes that is basically true. As mentioned above.

Note that for “reasons” the rated line is 5Wh/mi higher than the actual charging constant.

And because of the buffer you have to be 4.5% lower than that constant for mile-for-mile rolloff.

And because of heat losses you have to be about 1% lower than that as measured on the trip meter.

So for the non-P Model Y take 77.8kWh or so and divide by the rated miles on the Tesla website (whatever the true adjusted max rated range is for the vehicle). That will give you the charging constant.

When the vehicle is new and the energy exceeds the degradation threshold, you’ll be able to use a little more per mile and still achieve parity, since the rated mile energy content will be slightly inflated. (For example you might have 78.5kWh at 100% rather than 77.8kWh, in which case your rated miles will have 1% more energy than later in life, to hide initial capacity loss.)

So for Model Y with 77.8kWh battery with rated range of 326mi initially the constant is about 239Wh/mi. Line on energy screen is probably about 244Wh/mi.

And if you show some rated range loss, you need to get about 226Wh/mi on the trip meter for mile-for-rated-mile “parity.”
confirmed my line is exactly 244 ... 2021 LR 11/1 Delivery

PXL_20220117_190440892.MP.jpg
 
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AHA! thanks for examples and info. My Lexus 014 RX hybrid gets 30-32mpg @ $4.90/gal. My 7 mo old MY calculates out to 125mpg. But given my electricity costs of $.32/KwH(home charging 110A circuit) I figure it’s the equivalent of a 60mpg car so twice as good as Lexus. Hawaii kind of expensive.
 

jcanoe

Well-Known Member
Oct 2, 2020
5,327
5,814
Maryland
AHA! thanks for examples and info. My Lexus 014 RX hybrid gets 30-32mpg @ $4.90/gal. My 7 mo old MY calculates out to 125mpg. But given my electricity costs of $.32/KwH(home charging 110A circuit) I figure it’s the equivalent of a 60mpg car so twice as good as Lexus. Hawaii kind of expensive.
Don't forget about the benefit of being able to charge at home. You probably have a preferred gas station but it may not be all that convenient or safe.
 
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my Y is 300wh/mi, missing my egolf's amazing 200wh/mi ,with today's $0.32/kwh rate, it is pretty bad.
Is it possible you are enjoying the power of your MY which you could never get out of a egolf? That in itself is worth a few KWH no matter what the local electric costs. Find cheap electric provider or make your own!
 
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