Offshoreonly.com - 300x on 87 octane

Quote:

Originally Posted by rsess (Post 1291547)

My marina is threatening to stop selling 91 octane this year. I know that the 275 Verado and some of the Mercury Racing I/O's (new HP 850 at least) can be operated on 87. A knock sensor retards the timing or something and the power is reduced. Is this the case with the 300x.

300X + 87 octane = BANG, BOOM, SEE YA!

Quote:

Originally Posted by Tantrum (Post 1291920)

I am also running 300x's and have a concern that 91+ is going to be hard to find in one of the area's I boat. Im under the belief that 89 is out of the question.
Is this TK-7 stuff safe to keep on board or is it highly flammable. I would be interested in keeping a few gallons on board to add if the fuel I was putting in was questionable.
Thoughts?????

The 300XS also requires 91. Using 87 may result in a smaller BANG, BOOM, SEE YA.

You can do you own blend.

1 gal 87 + 1 gal 93 = 2 gal 90
1 gal 89 + 1 gal 93 = 2 gal 91

You can also use a good octane booster. Remember octane rating is not a measure of the energy/power in the fuel, it is just how compressible it is.

I should note, that some vendors will put a different mix of additives in various octane rating gasolines, and some additives can promote better/longer engine life.