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Cost comparison

Patrick W

Active Member
Mar 17, 2015
1,500
922
SLC, UT
I'm trying to compare the cost of "fuel" to drive my S vs my ICE. Anyone here care to check my figures?

My ICE gets 27 MPG.

Gasoline currently costs $2.96 per gallon (a bargain compared to the rest of the world).

The display on my S says I have driven 4,090 miles since resetting the counter and that during that time I used 1,136 kwh.

With electricity currently costing $0.088854 per kwh I spent $100.93 to power the S.

If I had driven the same distance in my ICE I would have burned 151.5 gallons of gasoline costing $448.40.

So about $101 in "fuel" for the S and about $450 in fuel for the ICE.

Does that look right?

Thanks!
 
Last edited:

deonb

Active Member
Mar 4, 2013
4,061
4,362
Redmond, WA
Unless you've measured the 1136 kWh at the wall, your numbers are probably a little light.

Your actual usage was likely around 15% higher than that (so 1306 kWh), due to charging losses and vampire drain.

That would mean $116 instead of $101.

Not a huge difference though.
 
I'm trying to compare the cost of "fuel" to drive my S vs my ICE. Anyone here care to check my figures?

My ICE gets 27 MPG.

Gasoline currently costs $2.96 per gallon (a bargain compared to the rest of the world).

The display on my S says I have driven 4,090 miles since resetting the counter and that during that time I used 1,136 kwh.

With electricity currently costing $0.088854 per kwh I spent $100.93 to power the S.

If I had driven the same distance in my ICE I would have burned 151.5 gallons of gasoline costing $448.40.

So about $101 in "fuel" for the S and about $450 in fuel for the ICE.

Does that look right?

Thanks!

You used about 8% - 10% more AC electricity than the battery received in DC. Did you measure kWh usage at a dedicated power meter, or calculate from battery metrics?
 

Patrick W

Active Member
Mar 17, 2015
1,500
922
SLC, UT
Unless you've measured the 1136 kWh at the wall, your numbers are probably a little light.

Your actual usage was likely around 15% higher than that (so 1306 kWh), due to charging losses and vampire drain.

That would mean $116 instead of $101.

Not a huge difference though.

Ah, had not thought of that. But even with that I'm guessing I actually spent well under $100 as a lot of what I used came from super chargers.
 

deonb

Active Member
Mar 4, 2013
4,061
4,362
Redmond, WA

BoerumHill

not great not terrible
Apr 23, 2015
736
218
New York, NY
Markup vs. markdown effect.

18% loss in efficiency, marked up becomes 22% "higher than expected".

Bingo! Great point, makes perfect sense when you run the numbers. His efficiency was 81.4%; consumption was 728, actual meter usage was 894. But if you extrapolated the cost (I know he paid $0.24 per other blog posts, no TOU plan available in MA), the consumption appears to have cost $174.72 when in fact it was $214.56, or 22.8% higher.
 

deonb

Active Member
Mar 4, 2013
4,061
4,362
Redmond, WA
Bingo! Great point, makes perfect sense when you run the numbers. His efficiency was 81.4%; consumption was 728, actual meter usage was 894. But if you extrapolated the cost (I know he paid $0.24 per other blog posts, no TOU plan available in MA), the consumption appears to have cost $174.72 when in fact it was $214.56, or 22.8% higher.

Or put another way, 100 / 81.4 = 122.8% :)
 

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