When my Low Fuel light comes on how much fuel is left? I think the most I've had to put in my 03 Supercrew is around 23 gallons. Is it a 25 gallon tank?

 

If you do a search there should be a couple of threads about the size of your tank and how much is left when the light comes on. One way you could do it is when your light comes on turn the truck off and push in on the trip odometer button and hold it in while you start the truck, keep holding it after you start the truck until you see it say test, keep pushing it and it will test the guages and all the dash warining lights and eventually it will say fuel. Its a digital readout of the gas in your tank. It also has a digital tach, speedo and abunch of other stuff i have no idea what it is.

 

When my low fuel light comes on, I got approximately 50 miles left. I got a 30gal tank