Re: Low gas mileage!
I met a guy who rides close to 70 miles a day. He's retired and dying of cancer so it's what he does to keep entertained. He's got the big tank and carrys 2 spare bottles of gas (about the size for a small Gator-aid bottle. He says he goes through all that gas every day. He says he gets about 70 mi. to a gallon of fuel.
He's a big guy, well over 200 lbs with a regular 44t sprocket.
Hope that gives you some insight.