I took a 29 mile trip on the weekend with my 1988 Bayliner Capri 1500. The boat has a 50hp Force on it. There were 2 adults onboard, 2x 6.6 gal tanks of gas, fishing rods, tackle box, cooler and miscellaneous small items. I cruised at 80% WOT most of the way (20 MPH) with the exception of...