Evinrude 70hp - 1979 Model

[Searanger Perth]

Hi Guys<br /><br />Just curious to find out how much fuel my 70hp evinrude should consume per hour on a 15ft fibreglass half cabin with 2 people on board in calm waters.<br /><br />Thanks in advance for any help given.<br /><br />

 

[C-RAVEN]

Re: Evinrude 70hp - 1979 Model

there are a lot of variables, are you cruising at 1/2 throttle or running wot ?<br />i would suggest that between these speeds you will burn about a gallon an hour, more or less depending on the engine rpm's

 

[Searanger Perth]

Re: Evinrude 70hp - 1979 Model

Hi C-Raven<br /><br />Would certainly be cruising at less than 1/2 throttle, last time i was out i used approx 20 litres in 2 hours with an average speed of about 10 knots in calm waters.<br /><br />Regards<br /><br />Eddy

 

[C-RAVEN]

Re: Evinrude 70hp - 1979 Model

sounds like you are using a lot of fuel....<br />do you have full power? if you are runnning on less than 3 cylinders ,there will be lot of fuel wasted <br />on incomplete burn.

 

[Paul Moir]

Re: Evinrude 70hp - 1979 Model

10 litres per hour (2.6 GPH to our American cousins) sound about right to me for a 70hp engine running around at less than 1/2 throttle. You'll find your best 'mileage' when at around 3/4 of full throttle RPMS, where your fully up on plane and you don't have your transom hanging in the water. Planing powerboats are woefully inefficient at lower speeds.<br />With boats, fuel consumption is pretty much a function of engine size. The more HP, the more it's going to drink. New technology (4-stroke, DFI, etc) helps a bit, but you're still pushing through water.

 

[Dhadley]

Re: Evinrude 70hp - 1979 Model

Not bad. Rule of thumb -- it takes about 1 gallon of gas to make 10 hp at wide open throttle. Theoriticaly your 70 hp will burn about 7 gallons per hour at wide open. If youre about 1/2 that at cruise, thats pretty good.