Have a 08 20ft North River Mariner with Yamaha 150/105 OB Jet,,, boat has 3/16'' bottom that's 6ft wide with a 96'' beam,, has a 12 degree bottom with a 14'' wide planing pad and a jet tunnel,,,30'' sides .125 thick,,,, it will run 8'' ,,, has a 42 gal fuel tank in its belly and carry 2 9 gal plastic fuel tanks ,, get about 1.5 mpg max,,,, runs 30mph with me and gear 25mph 3 n gear,,