We had a 42 powered by in line 6cyl 315hp Cummins. She liked to cruise 1750 -1800 rpm and made 9.5 kts. Fast cruise was 12-14 kts, fuel burn jumped from 5 mph. WOT was 17.5 kts, it looked like much larger vessel was creating that wake, but we could roll over the bow wave and actually get on plane. Only did that on rare occasions; sea trial at sale was one. God knows what the fuel burn was at that speed, I did notice that we'd increase speed just a bit if we held WOT for 15 minutes; lighter fuel load I guess.
Plenty of space to get around in the ER.
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