justin_o_guy2 wrote on 06/01/17 at 15:58:30:MPG is an indicator of tune. He's trying to get it running right.
What exhaust system is on it?
Are you Sure your rider isn't stealing the gas?
Gas leaks?
I have no idea what exhaust is on it. It has a short section of braided wire and about 1 foot of chrome at the end and emits towards outside, not the rear of the bike.
I am not sure that the rider is not stealing gas but that an be checked by having someone else ride for a day.
Gas leak might be an issue, there's a new Raptor petcock that is shut off when he bike is not being used. I hear leaving it on isn't a good idea but maybe to look for a leak.
Today at 2.3 gallons the bike travelled 86.6 miles before "Sputtering a few seconds then emitting a much louder than normal backfire then powering off."