Looking for ideas here... I have rather large tanks on a bike I'm currently racing in stage rallies (Safari tanks on a 990 Adv). There are many instances where I'd like to be able to pretty accurately determine how much fuel I've used between services so as to add exactly as much fuel as I feel I need to make it to the next service. On stock tanks I usually just fill them up (two 2.5 gal tanks), but with two ~5.5 gal tanks that's a lot of fuel to carry unnecessarily. I envision something like a long, plastic dipstick that I set into a notch with known fuel heights on it - I could easily determine this by just draining the tank, pouring a gallon, measuring and marking, etc. It seems like the red path would be best to determine fill height, a shape which probably lends itself to a clothes hanger, but I'm worried I'd bend it out of shape accidently. It's fairly hard to determine consumption due to differences in terrain, transit length, how well the bike is running, etc. I would loved to have gotten the translucent tanks but these opaque white ones were on the bike when I bought it... Any ideas?