What irritates me is people that drive these big vehicles like maniacs and then complain about the gas mileage.
"My tahoe only gets 5mpg"
"Well duh, I just watched you take off wide open from all 8 stoplights that are 500 feet apart"
And yes I've had that conversation. In my opinion, people that drive fast have no grounds for complaining about gas mileage and prices.