Started out with a full tank. Took a passenger that weighs around 120 pounds up the hills, through the dells, along the river. A fair amount of twisties and gear-changing. Put on 62 miles, went into the gas station and put a little over 2 gallons in the tank. BTW- this is a BMW R100/2 conversion w Steib S500. Is it possible I'm only getting around 30mpg ?!