Gas Mileage 3.7 170hp mercruiser

[Kgonefishin]

I have a 19 foot wellcraft with a 3.7 mercruiser I/O I was wondering what kind of gas mileage can I expect to get, like how many miles per gallon running at say 3-4K rpm <br />basically cruising speed. Gas gauge is broke just got the boat and didnt replace gauge and or sending unit yet but the walleye are biting and I want to get out. Thanks dudes

 

[Bob_VT]

Re: Gas Mileage 3.7 170hp mercruiser

Fantastic economy. I have never measured mpg but there is a sweet spot about 3400 rpms on mine where it goes all day and the next day too.(I do have a 50 gal tank!)<br /><br />Great motor if you keep it up to date and stay ontop of the known problems...cam seals, waterpump leaks, electrical and exhaust.<br /><br />Bob

 

[jfc092]

Re: Gas Mileage 3.7 170hp mercruiser

The 3.7 mercruiser, otherwise known as the 470 Merc has a reputation of being a problem engine because of the earlier version 3 inch heat exchanger that overheated, the internal stator electrical system that would go bad and the camshaft seals that eventually leak and are a royal pain to replace. (I just did mine) <br /><br />BUT, when that powerhouse of a 4 cylinder is running right, she runs and runs and is one of the most fuel efficent engines out there. Good luck with yours !!!

 

[Boatist]

Re: Gas Mileage 3.7 170hp mercruiser

My 3.0 L 140 HP in the ocean swells and wind gets about 3.3 MPH on a 21 foot closed bow Aluminum runabout at 2500 to 3000 RPMs. Most I run with on the trip out 25 miles or 60 miles round trip will use more. I always end up useing 18 gallons or very close to that.