Subject: I have a crazy wife
From: Eisboch
"In many cases, single-engine models provide efficient cruising in the
8- to 9- knot range and burn a stingy three gallons per hour (gph).
Top-end speeds rise to 10 to 11 knots, but fuel consumption jumps to 12 gph"
It doesn't really say what engine.
Bigger single than a 120 Lehman. Perhaps a Cummins.
Capt. Bill