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Coincidentally, I Saw a Prius vanity plate yesterday that said "SIPNGAS". Personally, I'd just thank them for using less because that keeps demand that much lower and I don't have to pay more for all the gas that my car guzzles. (Not that I want to be wasteful but it seems like the best way to deflate someone who feels like they need to advertise their fuel economy.)
I don't mind a Prius. I think they are great cars for what they are trying to achieve...which is basically to save gas and be a reliable transportation, nothing else. I don't understand why all the bashing about them. Different cars serve different purposes, and none is trying to pretend to be something they're not.