Our MK1 with twin 4-236 Perkins has a sweet spot at 1700 rpms, giving us 7.5 knots, +/- current, wind, etc. Going faster than that raises the bow, digs a hole behind, and really starts sucking fuel. WOT only gives 8.5 kts, sluggish handling, and a fuel burn only a Saudi sheik would love. I...