A Prius at 46 mpg (
Toyota Prius MPG - Actual MPG from 5,385 Toyota Prius owners) running 2.81/g regular (CA avg) is 6.1 cents per mile.
3 miles per kWh (.20) is 6.7 when paying for SC quick charges.
$6 more per thousand miles or $72 per year for the average driver assuming you never charge at home and have depleted your 400kWh. $26 more than a Prius if you drive from LA to NY and back.
Going to say that overnight stays that have free charging during a year and the free 400 kWh cover that $72 without charging at home.