If you do want an accurate MPG, you should always fill the same way and to the same level. I put mine up on the center stand and give the bike a little shake when the fuel nears the top of the tank. The filler port has a neck that extends down into the tank a little that will trap air and prevent you from really filling the tank. I usually shake and fill to completely top off the tank if I fill right before I'm going to use that extra fuel. If I'm just fueling and then putting the bike away, I'll leave some room in the tank for expansion of the fuel.
I've never filled while the bike was on the sidestand because it looks like the tank wouldn't hold as much while leaned over like that. I could be wrong though as the lean isn't all that much and I'm unaware of the actual shape of the fuel tank.
I don't recall ever having the MPG gauge on the cluster be "optimistic" and report a higher value than what I calculated though. Usually it's within about 2-4 MPG for me.
I've never filled while the bike was on the sidestand because it looks like the tank wouldn't hold as much while leaned over like that. I could be wrong though as the lean isn't all that much and I'm unaware of the actual shape of the fuel tank.
I don't recall ever having the MPG gauge on the cluster be "optimistic" and report a higher value than what I calculated though. Usually it's within about 2-4 MPG for me.
