I dont know if this is a thing or not: when I got my bike the previous owner said he normally flips the tank over at 200 miles. I can just get a bit further than that before it starts sputtering.
I did not know my bike had a fuel pump till recently. Is it safe to assume (like a car) that its not a good idea to let the main tank run dry and then flip to the reserve? I cant imagine any fuel pump likes to suck air.
If it really is an issue I will start flipping to reserve at 190 miles. I always stop within a few miles anyway. I have run 240 miles on both sides on a long trip, but as a general rule once I flip it, I stop for gas ASAP.
I ran a bike empty many years ago at 2AM on a sunday night in the middle of a residential area. Never want to do that again. Fortunately a nice guy was taking out his trash, and I asked him nicely if he had a gas can in his garage with a quart of fuel...