Almost exactly 2 gal. I have a 06 Rubicon with lower gearing and i have had to go 35 miles once with the light on, so the guy that went 20 miles still had some to go.
you never really wanna run it untill its completly empty. If you vehicle happens to have quite a few miles on it, the in take pump might suck up some of the crud in the tank and fry. Did it to my dad's Comanchee, thats one $120 lesson learned.
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