SUV's maybe horrid for the environment, but it'd help if we cleaned them up a bit. 10mpg in an suv that gets 13mpg is a huge increase in fuel economy, and a huge decrease in fuel consumption.
SUV's still dominate the US sales, so if SUV's got 30mpg, it'd still be better than 10. a few mpg will go a long way if over 50 percent (I think that's what I read) of auto sales are SUV's.
Hopefully though, we can get fuels to be renewable soon, so we don't have to worry as much.