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Yep, there is an equivalent rule of thumb for 4-strokes. It's approx. 9 gph for a 90hp at WOT. Direct injection 2-strokes are no worse at WOT, sometimes better.
It is based on vessel load, people, weight, tide, wind, sea conditions etc.
With a 4 stroke you should use about 3-4 gallons an hour at 4000 rpm. About 5-6 miles per gallon.
I get this on a montauk 17 with 2 people, calm water and staying at 4000rpm.
I have a 90hp 4 stroke Yamaha.
souweine wrote:
How about at cruising? 2500 - 3500 rpm?
Best way to get your arms around this is to look at the tests published on Mercury's website: http://www.mercurymarine.com/look_deeper/index.php
Focus on the "BHB" (Boathouse Bulletin) tests. The head-to-head tests sometimes don't provide as much detail. Be sure to look at several tests and average the results. Once in a while, there will be one in there that looks kind of out-of-whack.
Direct injection 2-strokes are no worse at WOT, sometimes better.
