I was doing the metric equivalent.
The problem is mLs and ounces sound too small.
The good thing about 100 is that in turns mLs and ounces into liters and pounds, or gallons, as the case may be;
but that 100—I like units more than x-number-of-units as the basis of expression.
Nonetheless, I guess its GPHM, LPHKM, GPH, and LPH, until we come up with something better.
Then we have wp:natural gas vehicles and wp:miles per gallon gasoline equivalent, as LNG, CNG, and electric will probably become more common.
If 33.40 kilowatt-hours/mile ≈ 74.71 Mj/km
then if an electric car had an MPG equivalent of 40,
it'd be 0.835 kilowatt-hours/mile ≈ 1.87 Mj/km