A fuel gauge using a float & sending unit - whether it's in a car or motorcycle - isn't a calibrated measuring device. They are mostly inaccurate.
The gauge itself relies on current heating a bimetallic strip to move the needle. Some cars use a microprocessor... but I'm guessing Harleys do not.
Once you understand how they work, you should be impressed with their accuracy. ;-)
For the most part I ignore the fuel gauge. That & the range (r) are but general indicators.
I reset a trip odometer when filling up and once it gets north of 200 I'm ready to stop. I have no desire to ride until it's on fumes.
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