I have a 30yr old jeep that meets emissions every year. It probably gets better gas millage than your car (and no I don't mean that bullshit sticker in the window, I mean your REAL gas millage.) The problem is people don't know how to do basic maintenance on their own cars anymore. The computer compensates for the fact the owner never changes their sparkplugs, oil, belts, air filter, etc... when the computer finally can't make enough adjustments to keep the car running it finally dies... the owner takes it in and OMG! It needs a new everything!! How could that have happened? It was fine last week! A well maintained hummer probably gets better gas millage than any 5+ year old prius with a bad owner.