"Inno" wrote in message
ups.com...
I've had my "new" 99 Larson LXi 186 out for two weekends now and cannot
believe the gas consumption. At around 25 mph it uses about half a
tank per hour! I think it works out to around 2 mpg!!! I expected at
least 5 mpg, and even that would not be impressive.

I have changed the plugs since last weekend as they were a little
carboned up, but not bad. Can't see any improvement in fuel
consumption. I am planning on getting a mechanic to look at timing and
carburetor settings.

Anything else that folks can suggest I look into myself before that?
The boat has been lightly loaded and I think I am not messing up the
trim too badly, after getting some advice here.

TIA.


I have 4.3 merc 18.5 Chaparral, not sure of gph but for 1/2 tank approx 10
gal, I can tow kids on a tube for about 4 hours. The boat pulls me out of
the water one ski easily and I weigh 200 lbs. Top end about 50 mph.

If I had to guess I would say get your carburetor rebuilt, sounds like you
are dumping too much gas into the engine, especially if your plugs are
black. If you just bought the boat and are taking it to a mechanic, have
him do the whole tune up and carb rebuild, cap wires timing, change gear oil
etc. Unless you feel comfortable doing those things yourself....