I respectfully disagree...
in some "newer" boats there is about a 10% differential if any at all between an A-4 and a diesel... now a perryman(sp) or palmer, thats a different story, but they're few and far between.
in anything 25 yrs old or older, there is no price differential between any gas, and any diesel.
You will burn about 1/4 to 1/2 a gallon per hr while at full throttle with the A-4. About the same with a diesel.
Your "range" is totally dependent on the tank size, and in my experience, the "larger" tanks, are on "larger" boats.
Consider Cat 27's and Cat 30's... no difference in tank size between gas and diesel.
I've heard this so many times I should have it tattooed somewhere.
Lets go over it once again shall we?
Oil filter for an a-4, whoops, they ain't gots one.
Oil filter for a diesel?
about 12.00 (and up, and can you walk into your local NAPA and get one?)
Fuel filter for A-4, about 4 bucks. (same with the napa thing)
Fuel Filters for the Diesels? around 15.00, each, plus any Racors you may have.
Cap, rotor, condenser and points for A-4, about 20.00.
None on diesel, mine ran about 3 yrs before they had to be replaced.
Plug wires? 17.50 none on Diesel
Plugs? total, 8 bucks. None on Diesel.
Ok, now on that Diesel, you do have injectors, just throw out a price on a rebuilt one, k?
About 60.00 each.
Lets not forget the changing fuel filters.../crack/bleed/tighten rinse - repeat routine.
I can appreciate the personal preference of a diesel. But thats all it is, a personal preference.
Universal put over 40,000 engines in various boats. They can't have sucked too bad.