And this is why I have added extra fuel to my tool kit.
I'm considering picking up an MSR can for DrDemso to keep when he takes that S4R out again, as well as finding an easy-to-use siphon. The three of us included a Honda Blackbird and an Aprilia Falco, and wouldn't have had any issues with a siphon, thanks to the 6.1 gallon tank on the Blackbird.
When I ran out on the S4R, DrDesmo took the Blackbird down the road, grabbed a fuel can, and zip tied it to his luggage rack. After that point, we instituted an 80-mile rule - next gas station we pass after 80 miles is where we stop for fuel.