The simple solution is the Floscan analog single gage. It will show you your instantaneous consumption with a needle, so you can trim or tab to get the best fuel numbers for the speed you are making and will also show you the total gallons used since re-set. I trust 'em more than the gas gage. You fill the tank, zero the meter and if it says you used 52 gallons, you'll put it about 51.5.
There's one listed on eBay for $200 that is good for up to 32 gallons per hour. That is the size I ran on the Stamas with Honda 22's and I never hit 32. I'll PM you the link
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