ij,, no problemo with the shutt off thingy. I top off my tank(s) so as to get that last, believe it or not, there is another 1/2gal capacity-volume past the bottom of the bowl on most tanks. I top em off. if your careful with a pump that doesnt have too much pressure, you can BURP your tank several times. just wait a moment, sometimes jiggle the bike. i didnt say shake it. yep it will burp and you will see plenty room to add more Go Juice.
this probably isnt important to most folks as they never go below half tank anyway. I tend to run mine (am down to 3 sleds) till they cough. an extra half gallon is sometimes the diff 'tween pulling up to the pump or coasting that last 1/4 mile.. hey everybodys gott their something.. this just happens to be mine. poncho
ps. I think I went 240 miles last tank, am rite at 43mpg consistant.