Re: Fuel consumption of a nineteen with 140 hp Mercruiser
Hey Jim
Fwiw, I have a 19 with the 165hp. I check my fuel usage almost every time. Humminbird 798 bread crumb trail. When I boat in Lake Tahoe, elev. 6300' I use a 15" pitch prop and usually have 4 people in the boat. I do a 50 mile run, 75% of the time cruising around 25 mph. The rest of the time around 10 mph checking out the scenery. I'll average between 4 and 4.5 mpg. We also boat at Pyramid Lake, elev. 3800' here I use a 17" prop with 4 to 5 people in the boat. We ski & tube and to get to our favorite spot across the lake is 8 miles away. We'll do 2 or 3 pulls a person then cruise back. I run around 30 mph to get back and forth across the lake, approx. 3/4 throttle. The worst fuel mileage we've ever had is 4 mpg. Can't help you with WOT fuel use, never ran it WOT more than 10 minutes or so. My old boat was a 1978 20' Sleekcraft modified tunnel hull with a 175hp Johnson outboard and it would only get about 2 mpg. The old carbureted 2 strokes were horrible on fuel. Depending on your boatn style I would think the 140 might be a little better then my 165, especially at lower speed cruising but if you start loading it down the engines gonna work a lot harder.
Hope I helped, Good Luck!