I have a 2001 sub and the 8.1 getting 11 mpg makes long trips a stop n go affair! Since the sub already has a 30ish gallon front tank, and a 10ish gallon rear tank, what would be involved in taking a 42 gallon tank from a late 90's sub and put it in the rear in place of the small stock tank and move the spare?
Anybody done it?
Anybody done it?