Using the EIA’s avg residential kWh cost (Dec. ‘18), AAA’s current avg cost of regular unleaded (3/4/19), and the EPA new car avg of 22 MPG, and based on driving 15k miles per year, here’s the five-year fuel savings, by state, of replacing an average gasoline-powered car with a ‘19 Tesla Model 3 Mid-Range (rated at 27 kWh per 100 mi - numbers not yet released for $35k base model). Washington is by far the best, at just over $7900 in savings, and Rhode Island comes in last, at $3600 in savings. In 35 of 50 states, one would save $5000-6000.*
*In a previous post, Tekamul brought up charge efficiency ratio: The 27 reflects how much power exists the battery to drive 100 miles. But to put that 27kWh back, you need to supply ~30kWh, as some of that power turns to heat in the cord, BMS and batteries during charging. Depending on you charge method (L1/2/3) there’s a different accepted ratio.
So, power “loss” during charging would drop the overall savings by some percentage (up to 10%).
Clearly, gasoline and electricity prices vary season-by-season, and year-by-year, but regional differences will largely remain the same, so I thought this would be an interesting look at the differences of making this change based on where you live.