Both of my cars get over 42 mpg, and the motorcycle is a four-stroke. I can't save the planet, but I do what I can. I don't speak for everyone...recommend considering adopting that stance.
4 stroke snowmobiles are the hype of the market right now, but there's no need to make the change, modern day 2 strokes from Skidoo, AKA Etec engines are cleaner then 4 strokes, get better mileage, and are approved via the EPA.
I live in a weather beaten area of the world where cars are pretty much useless, and a 6 cylinder turbo hybrid "truck" won't get the job done when it comes to pulling and hauling and going to the race track.
I'm sure we offset each other........I'm not too worried about it, it's a law of averages, whatever I burn up, I'm sure you offset by saving.