Going 50 mph felt like we just loafed along. At 40 mph, we only turned 3,800 rpm. But at that speed, rest assured, you can pretty much run through anything. Of course, this 42-footer uses a comparable amount of fuel to many convertibles. For example, at about 40 mph, we burned 40.8 gph. But we were, after all, doing 40 mph! Top end of 67 mph (6,050 rpm) drank 113 gph - obviously not a speed you want to see too often. Remarkably, it gets up on plane instantly, contrary to what you might expect from such a behemoth.