Quote:
Originally Posted by RoadCyclist
I always remember the fill up gallons and drive it down to a certain point on the fuel gauge.
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Well, that won't be precise enough to help you. The fuel gauge is too imprecise. And different gas station pumps vary a little. Your relatively small refueling amount (5 gal) all but guarantees more data noise than necessary because any variation has a larger effect on such a small total volume. Put it all together and you may never learn if your experiment is working.
Here is a more reliable method, under the circumstances: pick a specific pump at a specific station. Do all your refueling at that pump. When you fuel, set the flow rate to the slowest rate. Never top off. Always refuel on a close to empty tank if you can (safely). It does not matter precisely, but maybe wait until the low fuel light comes on.
If you do those things you experiment will take longer but you'll have somewhat better controlled for the imprecise instruments and hardware we have to use.