Last March I bought a 1979 Trojan 36 for a reasonable price needless
to say however the engines ran fine for the sea trial but it was all
down hill from there. I feel I paid a fair price for the boat and I am
considering replacing the Chryslers with New Crusader 8.1 engines
along with new gas tanks.

I have however not been able to find much information on what I can
expect on performance out of new engines on this boat. I am not sure
what I was exactly burning per hour on the Chryslers but I suspect it
was about 27-35 GPH. (One of the engines I was running most of the
year had low compression on 2 chambers. ) My cruising speed was about
20 -25 MPH at 3100 RPM when it was running.

I will be going from 330 HP to 385 HP and I am not sure if that should
help fuel economy. I am sure the fuel-injected engines should be more
fuel efficient but I am not sure by how much or what to expect, any
Ideas?