Ya know on the low fuel light it actually may be pretty accurate because filling can take half a gallon or more or less depending upon how long you keep pumping in that last squirt to top it off whereas running down to reserve is probably going to be pretty consistant and not off by half a gallon. Of course it does depend upon how accurate they measure the botton of the tank. I guess you could put less gas in when it lights up and test it several times by only adding a gallon or two each time and keep running it down to empty.
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