Old fashioned method:
1. Fill the tank full.
2. Go for a measured boat ride at a given rpm- say 10 miles round trip.
3. Then re fill tank and see how many gallons it takes.
Then you'll know for sure, absolute.
The older 225 loopers gulp fuel when you put the hammer down.
If running under 4,000 rpm shouldnt be too bad. If run hard...... I'd guess 20_+ gallons per hr no problem.
|