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I get a low fuel light at about 20 gal in the tank. It has always been like that.

I also use the odometer and refuel every 800 to 900 miles.

I am running a stock 26 gal tank w/a 50 Gal Transfer Flow in the bed.

I believe that the fuel light is just a reminder, just like the gauge is. Figure out the fuel burn and just let all the gimmicks offer advise. I also only run on the top half of the fuel when running around town.
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