I've ridden motorcycles with no fuel gauge. You ride it until it sputters, yes, then use the reserve (which gives you at least another 40 miles or so) and fill

I've ridden motorcycles with no fuel gauge. You ride it until it sputters, yes, then use the reserve (which gives you at least another 40 miles or so) and fill up. Or just use the odometer to guess. I'd just top up every 200mi or so. If you leave it on reserve you're SOL. :) Remember the old Game Boy? You wait until the power light goes a bit dim and change the batteries.