how many miles per gallon for a 1982 Johnson 90hp

[ib18]

I water tested my 1982 Johnson 90hp outboard V4 (4 cylinders and 2 cycles) with 3 adults on board. I burned about 4 gallons of gas for about 4 miles. A big gas guzzle machine. My boat is a fiber glass 1974 wellcraft 16' long.

Is that excessive or about average?

today's boat ride video will come shortly

 

[Chinewalker]

That seems a bit excessive. I have a 90 on my 18-foot Starcraft and I probably get around 3mpg at cruising speeds.

The general rule of thumb works out to about a gallon per hour per 10 horsepower at wide open throttle, so your 90 would burn approx. 9 gallons per hour at wide open.

 

[Fleetwin]

That seems a bit excessive. I have a 90 on my 18-foot Starcraft and I probably get around 3mpg at cruising speeds.
The general rule of thumb works out to about a gallon per hour per 10 horsepower at wide open throttle, so your 90 would burn approx. 9 gallons per hour at wide open.

^+1

 

[ib18]

Thanks, i will measure it again - here is the promised maiden voyage video - http://www.youtube.com/watch?v=_8sSnqvBnAw&list=UU5p-k-ES0WCY5ohK1t4TXYw

 

[ib18]

motor is getting about 3 miles a gallon - thanks for your reply

https://www.youtube.com/watch?v=u_8OjR0PuFM - more video here