On Sat, 16 Feb 2019 11:27:51 -0800 (PST), Tim
wrote:

On Saturday, February 16, 2019 at 11:11:56 AM UTC-6, wrote:
On Sat, 16 Feb 2019 08:45:57 -0800 (PST), Tim
wrote:


On Sat, 16 Feb 2019 06:07:37 -0800 (PST), Tim
wrote:
- show quoted text -
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Do you have a local airport? They all sell something called 100LL
(One hundred octane, low lead). It's pricey but you probably don't
need huge amounts.

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Seeing my Mercury 115 is a 1977, I’d think I’d like it. But carrying 40 gal might shuck a wallet quickly. Lol!

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Yeah, those bigger outboards can run through 40 gallons in no time at
all. I assume it's a 2 stroke? If so they seem to be a little less
prone to having the carb gum up. In my experience the problems arise
when the gas and motor sit around for a while. You could keep a
smaller tank of 100LL on hand and run the motor on it for a few
minutes before shutting down. That would help to avoid carb problems.
The other big issue with ethanol fuel is phase separation in the tank
which results in an accumulation of water. The judicious use of
Stabil and/or SeaFoam can help with that but I'd also add a good water
separating filter like a Racor between your fuel tank and the motor.
People are even doing this with dinghy motors.

Yessir, it's a 2-smoker. they guesstimate that WFO they're good for about 11 gal per hr. One advantage to them is the pwr to weight ratio. A 300 lb engine doing about 120 hp. isn't bad.

Not sure how it'll push this 28 ft bi-toon with a moderate load. but at 20 mph it doesn't take you very far on 40 gal.

There is a huge increase in economy if you run around 4000-4500 RPM
instead of WOT, particularly on a pontoon.
A lot of extra power just gets you a moderate gain in speed.
You are right about the weight tho. My old 3 cyl 2 smoke was a 70-90
hp class motor and it weighs the same as my 60-70.
I do use about half the gas I did with the 75 for the same cruise
speed.