I've not done over about a 50 mile ride. It will get longer. I've hit one 70+ mpg tank. It might have been 71 mpg. I'm averaging about 67 mpg. But I'm a bit more rural than most of you probably, so it is not uncommon for me to be running 55 mph - 65 mph. That will stop me from hitting 80 mpg or greater. Although, I don't consider my bike fully broken in either, with about 650 miles or so.
And in the near future, I'm going to be doing WOT / AFR / rejetting testing. So I doubt I'm going to see really good mpg for a while yet.
Someone asked if anyone carries an extra gallon. I'm with flitecontrol. My rear bumper would be asking for a break before I hit reserve. So to carry another gallon would be hiney suicide. But may be done if I was out west somewhere ... but even at that, surely a gas station can be found in 140 miles. The Piglet so far seems to hit reserve consistently between 140 and 145 miles. Lovin the Rebel!
2016 Honda Rebel 250 - The "Piglet."
Totally Stock at the moment.
Bought on 6/29/19 with 44 miles.