How do you answer when a stranger asks about MPG?

Is this really an "issue" for anyone? Who cares what anyone else thinks? If you are talking to an RVer who owns a 5th wheel and is considering buying a Class A then there might be a slight chance that the questioner is actually interested in the response. If you are parked at a Cracker Barrel and the guy with the Prius asks the same question, you should let him know that if it were not for you and the RV you drive, Global Warming never would have happened!