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I ran my new (to me) truck down into the red zone on the gas gauge just to see how far I could go, but when I filled it up (single rear tank) it still only took 10.9 gallons. I only got about 180 miles on the tank.
But after filling it the gas gauge only shows about 3/4 full. So it appears my gauge reads 1/4 tank low. Is there any way to adjust this? It's not much fun driving in the red zone.