What does it matter? Are you crossing some uninhabited area which has no gas stations?
Are you really counting on that extra 1/10 gallon? You are cutting it that close?
Go 150 miles then fill up. (or 100 miles, or 80 miles)
Or ride for 2 hours, then take a stretch break and fill up.
Or fill up when you are on the last mark on the fuel gauge
Or really full up when the gauge starts blinking.
Coming from the world of aviation....we never f-ck around with the fuel...we plan carefully, and allow generous reserve. We plan fuel stops enroute, and allow for unforeseen problems.
When the slightest doubt, we land and tank up.
Yes idiots still run out of gas in their airplanes! (because they are stupid)
Cookie
Yes. Yes, I ride in areas without gas stations.
I anticipate that your answer will be ~ well, just don't go there.
Sadly, for now, I have to leave my RE at home and take different bike.
_ Our exchange was to help better understand maximum range... not if one lives "in town".
IF this notion of the canister saturation really matters. I think it does. You say that you have yanked your charcoal box but are still afraid to fill the tank fully. WTF
_ We all know that the gas gauge on motorcycles are iffy. Some more than others. Knowing how much less gas we get filling from the side stand should matter. Don't know how much X-country flying you do but I think you will agree that sometimes you need to calculate how stiff was that headwind for the first 2 hours of my flight. Obviously it matters less if one is doing local VFR hops. Sometimes, I ride the the last 40 miles of leg up in the mountains at dramatically reduced speeds.
_ So I think knowing the starting fuel volume makes sense.