[Sohcahtoa82]

"MPGe" is an odd measure and probably doesn't actually measure what people think it does. Miles (or km) per kWh (or 100 kWh, but really that's just multiplying by 100) is going to be a better measure.

When I think of "MPGe", my incorrect intuition is that it's factoring in the cost of gas and the cost of electricity to create a cost per mile that results in an "MPGe" relative to gas prices. ie, a 60 MPGe car would cost half as much per mile as a 30 MPGe car.

But as mentioned, this is incorrect. "MPGe" is based purely on some idea of how much energy a gallon of gas has in kWh, and miles/kWh is used to calculate that.

The result is that a 60 MPGe car could cost just as much, if not more, to drive than a 30 MPG ICE if gas prices are low while electricity costs are high.

[jauntywundrkind]

It's called miles per gallon equivalent. To me, the name is plenty clear & I don't see how one would be confused. Yes one needs to understand the price of those fuels to figure it out.

Miles per dollar would be extremely region specific. And temporally specific; it'd change as prices wax and wane. I don't see how such a MP$e would in practice work.

My understanding is much of the world does kWh/100KM, which by virtue of the constant gives a reasonable straight number. Tesla for example has a page called European Union Energy Label, where we get figures like: Model 3 Rear-Wheel Drive, 13,2 kWh/100 km. It's perceived as more human friendly I guess than .132kWh/KM.

It definitely does seem like having the two units - either 1 gallon or 33.7kWh EPA - makes it really hard for consumers to understand the relative merits of their vehicles.