Quote:
Originally Posted by saintglenn
I have 300 and previous owner says 1.5 an hour at 2000rpm. I have not gone on a trip far enough to measure. I will be going to port angeles on sept 22 and will try then to see.
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I think you previous owner was like mine.....
If you have a 120 or 135 Lehman...I would expect quite a bit over 2.0 gal/hr.
My 135 chart (which I have right in front of me) says almost 3 gal/hr and I know that to be trus as I ran the boat to NJ from Ft Lauderdales at around 8 knots (2000-2200) as the PO said 8 knot cruise and I was getting very poor milage compared to what I thought. After some fuel ups I knew that the consumption was 3-4 gal/hr. So my chart is in lockstep with my engine...and a 120 can't be that much different.
Here's another guys experience and I would say he's high on the curve (poor eng performance maybe?)
34'
marine trader 1973 120hp ford
lehman 2.3-2.6gph at 8 mph @1650 rpm
Here's another close to my curve...
1978 49 DeFever RPH 68,000lbs wet, twin 120 lehmans nap, @1700 rpm 7.3 kts fuel burn 4 gal/hr
He's close to my chart at 2gal/hr at 1700 RPM, my chart for the 135 says he should be slight;y under 2.0 gal/hr per engine