Since I've just been a victim of fuel-fooling, I guess I better 'fess up and share what I've learned the hard way, at least with an '09 S40. Expect to have to flip to reserve at about 60-70 miles traveled. Even though it LOOKS like there's a lot of fuel in the tank, it's really steep and the frame beam in the middle means your upper "on" petcock is not going to be able to reach most of what you have left. At least that's how it works on mine.
I'll pass on sharing how I learned this lesson...
but that's how my bike behaves. Or misbehaves.