What octane does everyone run?

[Wake Bandits]

Some people swear they feel a difference running a higher octane.
What motor you have and what octane do you run?
What's your take?

[CP3]

340hp marine power
I use regular because I know for a fact higher octane does nothing but cost more money unless... you have the timing on the motor changed to take advantage of the higher octane like I do on my truck. this has been debated before in the past

[G-MONEY]

mp 340 ....87 octane

[da.bell]

mp 340 ....87 octane

^^^ Ditto

[Razzman]

yup, even my old school boat doesn't care or notice difference.

[Timmy!]

I know guys with Gary Teague motors in their boats and they too are programmed for 87 octane.

[laserfish]

Mag 350, 315HP, and 87 octane. Tried higher, and could not tell any difference.

[Moki]

87 - Sometimes even 85 and have never noticed a difference.

[talltigeguy]

87 - Sometimes even 85 and have never noticed a difference.

Ditto.

[typerider]

Mag 350 w/ 87. never bothered with higher grade. these engines aren't super high compression or anything so they shouldn't need anything more than that.

[scoot18]

MP 340 use 87

[zad0030]

Merc 350, 87 I do notice it sputter a little getting a rider up.

[hoopykat]

MX 6.2L 340HP Black Scorpion...runs just fine on 87.

Mike

[chpthril]

There is NO performance gain with higher oct fuel. Only requires more heat to combust as what you find in a hi compression engine, that is where the performance comes from.

Both put out about 19,000 BTU's if I remember.

[tigeblue]

gas prices in california!



uh yeah I use 87