running the excaliber on 87 octane, PCM response.

[Mikeski]

My 05 has never had anything but 87 in it, I believe the sticker say run 87?

JeffSV211, I got ya by 20 hours (125hours) but I picked mine up in April..

[Socbum]

Hey Socbum, where did you get the recommendation to use 87 for your GT40? The only reason I try to use 89 is my manual specifically states to "use any good grade of automovie regular or premium gasoline with a minimum average octane rating of 89. An 87 average octane gasoline may be used if 89 is not available."

I always figured that meant if you can't get 89 at a marina, you probably won't do damage to the engine if you run 87. Maybe it means you can run 87 all the time?

I checked with the guys when I bought the boat (Navigation Co) and also with the guys that service the boat (Mid Ohio -- Jesse and Paul).

BTW -- I'm going to miss Jesse at Mid Ohio. If you did not know, he has moved on to something else.

[jeffsv211]

MikeSki.... I'm still logging hours, but my season is quickly coming to an end! I'd hate to figure out how many Gallons that is!

[Rock_Toy]

Real simple....if your motor isn't pinging, you are running the right octane. Remember that higher octane fuels are NOT more combustible: they are more stable. Accordingly, running 89 or 91 in a motor that will run fine on 87 is a waste of money.

[SGY]

It can also result in a minor loss in performance due to timing etc issues.