The Aptera Forum
Assuming a gallon of gasoline contains 32kW of energy and the Aptera reaches the 100mW per mile then one would get 320 MPGe. This assumes the goal of 100mW is reached. Other electrical loads (lights, computers, audio, pumps, fans, heat pump, etc.) may not be rolled into the 100mW per mile estimate. You can be assured that results will vary.
If you only drove at night and plug-in charged, you'd have one MPGe native to the drivetrain and aero etc. 200 MPGe? 300 MPGe? If you only drove 30 miles a day and parked in the sun, you'd get "infinity" MPGe?
I guess the EPA scheme doesn't care at all about the solar re-charging aspect and we'll never get "credit" for that in their MPGe rating. I realize if you tried to factor this in, there'd be great variation. You might not plug in for 3 months, then plug it in 3 times in one week...
Aptera mentioned 10mi/kWh using the EPA test cycle.
I don't know anyone besides them who uses "MPGe", but the conversion factor is 33.7, so that's 337MPGe.