You'll find that with the inboard diesels, this Marlin 35 tips the scales at just about 3,400 pounds heavier than its outboard sibling. Consequently, it doesn't qualify as the double-nickel speedster as the outboard models do. However, top speed with the diesels is still a not-too-shabby 42.6 mph. More important, cruising speed can be a steady 40 mph - 6 to 7 mph higher than the outboard models. But for real efficiency, run at the 33- to 34-mph outboard cruising speed and burn only 20 gph and you can stretch the effective range of this boat to over 300 miles.