We had the chance to test the new GT70 on a beautiful December day out of Fort Lauderdale, Florida, with a northerly breeze at 10 knots and an easy-rolling small swell left over from a diminishing cold front. She wasted no time in -getting on plane with her twin 2,600 hp MTU M96 engines pushing her along swiftly to speed. Make no mistake: This is a big boat, and she pushes a big hole in the air. But pushing the throttles up, she responded and clipped along smartly at 30.5 knots at 1,900 rpm and a 73 percent load with a fuel burn of 162 gallons per hour. Backing her down to a slow cruise at 1,700 rpm, she ran along at 25.8 knots, burning 120 gallons per hour at a 66 -percent load, an easy lope for the engines and the boat.