Fuel filler pipes

Depends on how you have it configured. They'll customize it to your order quite a bit like fuel fitting sizes, with or without spare tire cutout, extra depth, etc. I think the standard tank is around 16 gallons with the spare tire (what I got). I've never run the tank dry, so I can't confirm the exact number, but if I go off of the gas gauge I'd guess around 15-16. I think they can extend the depth of the tank to the limits of the tank straps to get another 1-2 gallons. Guessing that knocking out the spare cutout would probably be good for another few gallons, so maybe close to that 21.5 number.

I think I could probably make it fill faster as well if I messed with it some more, but it doesn't bother me enough to worry about it right now. If I drove the car more often I might be annoyed since I'd be filling the tank up more, but for know it's just something I try to remember.