EV thoughts: Most of us consider the powerplant to grid to charger to battery, then from battery to motor to wheel,
conversion to have significant losses.
What's interesting is that we now know exactly how big the losses are, as the US Government publishes them!
EV Grid to wheel efficiency is 59% to 62%.
https://www.fueleconomy.gov/feg/evtech.shtml
Worldwide fuel burning powerplant average efficiency is 33%
USA powerplant fuel burning efficiency average is possibly as high as 38%
(yes, the best NG powerplants can achieve 60% in ideal conditions)
National grid losses are about 7.5%
https://www.eia.gov/electricity/state/
We also know that EV's, driven normally in mixed driving consume about 340WH per mile. NOTE: Cold weather and heat use/Hot weather and AC use dramatically affect consumption. The 340wh per mile number is relatively accurate in overall use. Yes, some EV owners consume 280 wh per mile. They live in temperate climates, drive slow and don't use heat or AC.
Interestingly, it seems to take 1.6 gallons of fuel oil to make enough power to charge an EV to go 40 highway miles.
More interestingly, in some locations, (once fees and taxes are added in) EV's cost considerably more per mile than gas vehicles.
The Chevy Volt, which can be operated either as a EV or as a gas only vehicle costs 10c/mile (locally) on electric power and 5.3c/mile on gas.