And if the 4x4 is worse on gas you're then out an extra 5K plus the extra cost of gas which is recurring the entire time you own the vehicle. The extra electricity required to run either more or more dense modules is going to be fractions of a penny and isn't even a consideration.
PC to car analogies never work, just say no.
Yeah because a ram stick uses like 500 watts.
It's better to have something and not need it than to need it and not have it. Especially when there are no repercussions to having it in first place.