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Would the gas tank be bone dry in order to get 15mpg...15 mpg is pretty much the way it is with the P500 when you're riding hard. Our last 4 or 5 rides we've been riding with bigger machines with a ~30 mph pace. They just ride regular but we have to run these P5s pretty hard to maintain that pace... Anything over 60 miles and I need to stop for gas.