some people can go btween 10-20 miles on a tank of gas, depeds on conditions,what kinda of riding.ect... for carrying gas, if ur gonna be doing it alot some people get ims 5.6 gallon tanks, or put it in a 2.5 gallon holder in there backpack, or a sixpack rack with a place to hold gas, engines on 2 strokes need to be rebuilt every so often,more then 4 strokes, but its a hell of alot cheaper then a 4 stroke to