# Forums

## Tesla Model S MPG equivalant

I get asked by ICErs what the fuel costs are for my Model S. Not sure if this has already been done but I did the math based on my SoCal Edison off peak energy rates and local gas prices to create an MPG equivalent. These calcs are based on the 55 mph ranges posted on the Tesla website. So now I can answer that if I was buying gas the fuel costs would be equiv to a 150 MPG car.

The spreadsheet is here if anyone wants to play around with it to enter their local electricity and fuel costs.

60 KWh model
Elec Cost \$0.09 \$/KWh
Capacity 60 KWh
Range 206 M
Gas price \$4 gal
Tesla range/\$ 38.15 M/\$
MPG Equiv 152.59 MPG

85 KWh model
Elec Cost \$0.09 \$/KWh
Capacity 85 KWh
Range 265 M
Gas price \$4 gal
Tesla range/\$ 34.64 M/\$
MPG Equiv 138.56 MPG

Brian H | 04. Mai 2013

Just say, "If I paid cash for every fill-up, I'd get change from a tenner."

EVTripPlanner | 04. Mai 2013

I did a similar (but a bit more elaborate) analysis of electricity usage and gas equivalence at http://EVTripPlanner.com/calcs.php (you can download spreadsheet or PDF) - you have to include "vampire load" when *not* driving and use real-world kWh/mile to be accurate. ALso: let me know how to get .09 \$/kWh from SCE! Even super-off-peak with TOU-D-EV schedule runs about .11 (level/tier 1) and .19 (level/tier 2)

jbunn | 04. Mai 2013

+1 Brian.

Literally true.

steveray | 05. Mai 2013

Thanks Cliff for vampire load. I also didn't factor in a charging inefficiency which seems like it is pretty high based on another post I saw here. Using an actual KWh/m number would correspond to a "city MPG" I think, the one calculated using the rated range more of a "highway MPG".

The SCE cost came from here for summer Super Off Peak. Must confess I didn't check my recent correspondence with them to check if the rate is what they gave me.

https://www.sce.com/wps/portal/home/residential/electric-cars/residentia...

steveray | 06. Mai 2013

Updated the spreadsheet to factor in an inefficiency factor. I'd be shocked if the vampire loss isn't fixed fairly soon by a software update, as the Roadster vampire loss is negligible.

60 KWh model
Electricity Cost \$0.09 \$/KWh
Capacity 60 KWh
Range 206 M
charge/vampire 20% inefficiency
Gas price \$4 gal
Tesla range/\$ 30.52 M/\$
MPG Equiv 122.07 MPG

85 KWh model
Electricity Cost \$0.09 \$/KWh
Capacity 85 KWh
Range 265 M
charge/vampire 20% inefficiency
Gas price \$4 gal
Tesla range/\$ 27.71 M/\$
MPG Equiv 110.85 MPG