How did that number get figured? I know of no way to convert 1 gallon of gasoline to 33kwh of electricity. There are enormous losses involved in any conversion of gasoline to electricity so the number must be something like the amount of work a gallon of gas can do ... like power a car. If that's the way the equivalency is developed then no wonder all the math ends up with them equivalent. You come up with a more efficient car than the average car the equivalency was developed on and bingo, the more efficient car is more efficient.