I created a simple formula to figure out how much I save in my Tesla compared to my previous car.
Gas Car variables:
A = Fuel consumption in miles/gallon
B = Cost of fuel in dollars/gallon
Electric Car variables:
D = Fuel consumption in Wh/mile
E = Cost of fuel in Dollars/KWh
Savings/mile = B/A - E*D/1000
So, comparing my Model S to my previous 2013 BMW 328 xDrive, going 20,000 miles/year:
(The fuel consumption for both the Tesla and the BMW were my real world fuel consumption. I drive aggressively in both, greater than 90% on highway miles)
A = 28 miles/gal
B = $4/gal
D = 344 Wh/mile
E = $0.12/kWH
((4/28)-((0.12*344)/1000))*20000 = $2031/year savings in fuel.
Gas Car variables:
A = Fuel consumption in miles/gallon
B = Cost of fuel in dollars/gallon
Electric Car variables:
D = Fuel consumption in Wh/mile
E = Cost of fuel in Dollars/KWh
Savings/mile = B/A - E*D/1000
So, comparing my Model S to my previous 2013 BMW 328 xDrive, going 20,000 miles/year:
(The fuel consumption for both the Tesla and the BMW were my real world fuel consumption. I drive aggressively in both, greater than 90% on highway miles)
A = 28 miles/gal
B = $4/gal
D = 344 Wh/mile
E = $0.12/kWH
((4/28)-((0.12*344)/1000))*20000 = $2031/year savings in fuel.