We always seem to read about the mileage penalty when driving fast, but I'm also curious about the other side of the coin: How much power (fuel) does the MS "burn" in very slow, heavy traffic. I was stuck on the interstate recently, taking over an hour going through a 10 mile construction project. Temperature 90+ so my AC was blasting the entire time. Also, what about common, everyday commuting traffic - the kind common in major metro areas. I'm curious to know what the milage penalties are in such a situations. I'm not a member of the club yet, but hope to be when the supercharge stations get closer to my part of the country (Cincinnati).