I guess I'm a greenie twit. I feel guilty about driving my one ton truck around as my daily driver. So I try to ride my bike to work when I can. My S&B house is pretty efficient, we're always lower on our usage than comparable houses. But I love the RV lifestyle. I try to justify it by comparing what a hotel uses, the waste a restaurant creates and if we're to travel to our destination worth by plane or car, I'm using about the same fuel as an airplane or less but certainly more than a car. I guess the solution would be to not travel, but I choose to make up for my carbon footprint in other ways.
Maybe when diesel is $5 or $10 per gallon, I'll have to come up with some other vacation plans.