The rule of thumb is use the lowest grade gas your engine will burn without
pinging. None of my outboards ping with regular. If they did I'ld just add
some marine grade octane booster. I have a 200HP Mercury Mariner fuel
injected, a force 50 carberated, a MErcury 150HP carburated, and a 5HP Sears
contract built motor. They all run regular just fine.

Only one of my service trucks needs super. Its the one with the smallest
engine. I suspect that little four banger is tweaked out and the timing is
advanced in order to get enough power out of it to pull itself. It pings on
regular so I run super in it. My big 2500Hd with the V-8 runs great on
regular. So does the S-10 truck with the fuel injected V-6. Even after
reprogramming the onboard computer for a little better performance. The
programmer did allow for programming it to use higher octane gas, but the
performance program set for regular was adequate for use as a work truck.
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"WRH" wrote in message news:SJ2fc.888$2e6.748@lakeread01...
I'm just curious has to what grade gas most people use. Is it really a
waste
of money to use high test in a 20 yr old motor?

--
Bill
Chesapeake, Va