Should I??????

[kino_fab]

Not really. Just depends on what the truck weighs. I usually keep mine at about 3/8ths so I don't starve the Raptor pump, and with that I can hang about 300-400lbs up front to make 8000lbs, but thats taking out half the interior aswell. If your not hanging weight up front, then don't worry about how much fuel you have as long as too much fuel doesn't put you over weight.