That is a loaded question, fuel mileage varies greatly on this bike according to how you ride and what speed your cruising at. If you cruise at 55-60 you can get as much as 5-10 miles to the gallon more then you do if your cruising at 80. Keep track of your mileage for a while and it will give you a good idea how much you use average and then figure on no more then 4.5 gallons. There is no reason to pump the last bit out, it is very hard on submerged electric pumps. I know people run them out all the time but the pumps performance suffers a little each time they do.mrfredsporty said:what sort of distance should i be able to reach with the 5 gallon tank around town and on trip. what is your experience??