Detroit News: If I had my way, carmakers would create vehicles that run off of hot air. It’s the kind of development that might make the U.S. Congress useful. Really, the top U.S. legislative body should have convened in Los Angeles this week so its members could have seen the 2010 Ford Fusion hybrid in action. Rarely do you get the opportunity to see a midsize sedan average more than 43 mpg in city driving. Actually, no one has seen it before — not even the distinguished gentleman and …