Re: Merc 2.5L on Seafari?
1979 2.4L 200 vertical reed with the WH-11 carbs (small venturi) . . . I get better than 3.5mpg at cruise up to 35mph. After that economy falls off real fast. 2.4L motors with the small venturi carbs like the mid 80's 2.4L 175's and the early 2.4L 200's get great economy. The larger venturi carbs on 2.4L 200's and old 225 (wh-22's, wh-28's, wh-31's, wh - 15's, wh-20's) will feed the motor more fuel, but still will be better than 3mpg at 4000rpm pushing a 20. 2.5L motors are a different story . . . even 2.5L 150 EFI will burn more than a 200hp 2.4L Carb motor.
I think 2.5 - 2.75mpg would be ball park for a 2.5L on a 20, NoBones has one on his 20 . . . he could probably give you exact numbers. fgbiv had a 2.5L Mariner Magnum III on his seafari.
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Honestly I think a 2.0L 150 is a fantastic match of economy and power on the 20's. The 2.0L's will get you to 40mph and cruise at a nice west coast 25mph . . . I had one on the MA when I sold it. 25mph was 4mpg cruise.
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