Typically we get about 9 mpg at Mid-Ohio... If I remember correctly, we were maybe a little better at Gingerman, probably about 10 mpg.

How are you measuring fuel usage? To measure ours, we empty the tank completely, fill with 5 gallons, run 10 laps, and empty the tank again to measure usage. If you have a stock tank and you are only judging by filling the tank, and then refilling after your run, I'm not sure you will get a very accurate read (from our experience)