When the bike "runs out" of fuel,how much is it taking to fill it back up? How does this bike run? Any smoke of any color,some or all the time? My thinking is if this bike is getting app.18mpg,then some spark plug fouling should probably be occuring,or at least just not running well,low power etc. On previous threads,many of us discussed the poor calibration of the 1500's fuel sending unit. Thinking this one is just waaay off. Hope this helps the process.