[Michael]

yes the gas tank was full, the bike was straight when it was getting full. The gas went past the neck of the gas tank. I weight 200 pnds and I drive it around 70-85 on the freeway would ride it faster but it wont give me no more due to the wind.

I think this says it all. Under these conditions the mpg doesn't sound too bad. Back off a little and it would probably be a lot better.