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Author Topic:   Fuel usage / Outrage 18 2000
jacko posted 07-01-2002 04:54 AM ET (US)   Profile for jacko   Send Email to jacko  
I'm planning this saturday to go down the south coast of UK for 120 miles. There are no fuel stops on the way and I was wondering whether I will use more fuel per mile at 3/4 max rpm in a flat sea or 1/3 max rpm in a rough sea. Obviously I cannot choose the conditions but when its rough (6 feet waves) I throttle back alot and probably use more fuel.
I read somewhere, probably on this site, where you can calculate the amount of fuel your boat/engine combination will use. Anybody else seen it.
The boat is an Outrage 18 and the engine is a 175 Yamaha both 2000.
Has anybody tried to calculate how far their boat will run, say in average conditions (1-2 foot chop) starting with a full tank of fuel.
Clark Roberts posted 07-01-2002 12:42 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Jacko, no calculations that can take into account every variable (at least I don't know of any formula!). But knowing your range (miles/Kilos pre gal/liter) in varying conditions is very important when taking long trips and fuel stops are not close together! My suggestion is that you experiment and determine efficiency... top off tank and go a measured (known) distance and then top off tank again and note amount of fuel consummed... do this with varying loads and conditions and come up with a worst case mileage figure and then plan based on this figure... Happy Whalin'... Clark... Spruce Creek Navy
JohnAz posted 07-04-2002 08:02 AM ET (US)     Profile for JohnAz  Send Email to JohnAz     
check the milage reports in several boating reports in magazines,,,on your particular engine most show an optimum crusing rpm...the best seems to be 1,000 rpm, but you will take forever to get there,,,asuming no ad-verse tides or river curents,,,second best milage RPM seems to be between 2,500 and 3,500 depending on brand of motor and hull shape/weight
acseatsri posted 07-04-2002 10:57 AM ET (US)     Profile for acseatsri  Send Email to acseatsri     
A better way may be to install a fuel meter. Not that expensive for peace of mind.

jacko posted 07-09-2002 03:30 AM ET (US)     Profile for jacko  Send Email to jacko     
well I finally completed my trip. I probably used 2/3 of a tank approx. 60 gallons of fuel.
The wind was blowing about 20 knots on the port bow with a 5-6 foot swell with breaking crests. The boat performed magnificently. I dont think I would ever attempt this in any other 18 foot boat. I was achieving about 25 Knots at 4000rpm. It was hard work but great fun. The boat and engine never missed a beat.
Well done BW !!

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