[csvencer]

Svence The Johnson 150 and 175 up to 2001 are the same block,the 200,225 and 250 up to 2001 are the same block.
Most of the v-20's I have worked on came in at about 3600lbs loaded,not sure about the 4200lbs.
I do know your boat with a Yamaha F150 4-stroke will get a little over 4mpg cruising at 30-32mph

Yup you are right, 4200 was the trailered weight...whoops.

And I have seen the same results with a 140/150 Suzuki four stroke, right around 4 mpg.

-Svence