Cost per mile varies a lot per state, and varies differently for gas versus EV: * $/kWh varies by a factor of 2.2 within the continental U.S., from Washington

Cost per mile varies a lot per state, and varies differently for gas versus EV: * $/kWh varies by a factor of 2.2 within the continental U.S., from Washington at <$0.1/kWH to Connecticut and Alaska at >$0.2/kWH. (Hawaii is an outlier $0.3/kWH.) Source: https://www.eia.gov/electricity/monthly/epm_table_grapher.php?t=epmt_5_6_a https://www.eia.gov/electricity/monthly/epm_table_grapher.ph... * $/gallon varies by 1.4, from Midwestern states at around $2.3/gallon to Washington and California > $3/gallon. Source: http://www.gasbuddy.com/USA http://www.gasbuddy.com/USA * Some places gas is cheap and electricity is expensive, and vice versa. The ratio of $/kWh to $/gallon varies by a factor of 2.3 from gas-cheap NH, MA, and AK to gas-dear Washington and Oregon. * Some states get (much) colder in winter. Cold weather impacts EV mileage much worse than gas engine mileage, especially if you spend fuel on cabin heat. Maybe someone will build a calculator? It would be nice to have something like https://www.nytimes.com/interactive/2014/upshot/buy-rent-calculator.html?mcubz=1&_r=0 https://www.nytimes.com/interactive/2014/upshot/buy-rent-cal... for gas versus EV purchases. [Edited to replace 2011 kWH data by data from June 2017]