According to Jupiter president Carl Herndon, the traditional objection to sterndrives - that of corrosion vulnerability - is largely one of perception. But right or wrong, he says it hasn't been an issue for his customers, who usually keep their boats on lifts or trailers. Currently, Jupiter offers the 31 with diesel power up to 315 hp. Larger than that and you have to go with a bigger, heavier engine block. According to Herndon, the 315-hp setup pushes the 31 at a solid 30 knots, loaded, while burning seven gallons of fuel per hour. "For the guy who fishes offshore, this is great," he says.