hahah.
did you have 650miles on one tank?!?!
i think the my average is about 500. if in doin just plain highway i might get closer to 600 maybe but i really doubt it. the reason i ask is, because my speedometer/odemeter have never ever lasted for any entire tank of fuel. not even once. ive gotten 4/5ths of a tank and then it will quit. so i really dont have a true reading to go by.