And by that measure it could be said that "Liberals" driving tiny, lawnmower-motor-powered cars are not using gasoline "liberally" either.
I would imagine that most Conservatives don't consider their SUV's to be a 'waste' of gas either, but an entirely valid use for it, in that it provides a means of 'conserving' their families by providing a safer environment for them than the tiny cars do.
Doesn't matter to me really, its your wallet not mine, just saying.