Current capacity is fine, giving a range of approx 550 miles. Offer a tank the size of current after market tanks that in effect are 2 1/2 times as large as the standard tank (80 gal vs 35 gal {standard}). It will allow those who want a long range vehicle to also 'shop' for the least expensive fuel along the highway and byways of America. These after market tanks are custom molded to the bottom of the truck bed, so no room is taken up in the bed with auxillary tanks. The military uses large capacity tanks on many of its rolling stock, and these tanks are as tough or tougher than the standard tanks on current F-350 models.