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I am sure if we all slowed down some and drove like we had our grandmother on the back we could get alot better mileage but as long as it is better than 30 mpg it beats most cars and is alot more fun. To be honest I have no idea how many miles my bike gets if I start worring about that I guess I should quit riding.
2012 Lo with stage 1, Screaming eagle air breather and slip-ons, I get an average of 55mpg, now that is an imperial gallon, I guess that works out to about 46mpg for a US gallon, not too shabby I say. That is also driving 70mph on the highway, with a bit of town running.
My 2008 FXSTC averages right around 45-50 mpg on the freeway (depends on how I ride because I can get above 50 mpg if I'm easy on her) and maybe around 38 in town.