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Discussion in 'Outboard Maintenance' started by noeettica, Aug 5, 2009.
Was running my 15 hp Merc today It Uses Right at 2gph WFO Give or take ... Sound about Right ?
Wide open for 2 hours? were you making one of them "special" runs to our nieghbors to the south?
That doesn't sound to bad to me.
Researched this question a few years ago.
Basic rule of thumb:
Horsepower divided by 10
is the number of gallons burned per hour WOT
10 hp burns 1 gallon per hour WOT
100 hp burns 10 gallons per hour WOT
so 15 hp burns 1.5 gallons per hour WOT
If you want to get picky use these formulas:
An in-tune four-stroke gasoline engine will burn about 0.4 to 0.45 pounds of fuel per hour for each unit of horsepower.
A well-maintained two-stroke outboard burns nearly 0.6 to 0.8 pounds of fuel per hour for each unit of horsepower.
Gasoline averages 6.2 pounds per gallon (depends on type)
I knew I could count on you ...
I do not think there is a thermostat in the motor ... lol
[smiley=1-mmm.gif]taking this one step further.
10 hp 100miles / 18mph = 5.55 hours x 1 gal = 5.55 gals to go 100 miles
15 hp 100miles / 23mph = 4.35 Hours x 1.5 gals = 6.52 gals to go 100 miles
25 hp 100miles / 30mph = 3.33 Hours x 2.5 gals = 8.33 gals to go 100 miles
15hp [smiley=40s.gif] [smiley=40s.gif]
25hp [smiley=40s.gif] [smiley=40s.gif] [smiley=40s.gif]
When you feel the need for speed, be prepared to let your wallet bleed!
Wanna haul azz? Gotta burn gazz!
Saving time costs money.