Fuel Types?

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09-17-2006, 03:53 AM

Shifty

Thread Starter

Join Date: Sep 2006

Posts: 24

Fuel Types?

I just filled my tank tonight with 91 octane gass like usual. Will the engine perform worse if i move down to 89 octane or "regular"?

09-17-2006, 11:02 AM

RTexasF

Super Member

Join Date: Nov 2004

Location: Brownsville, TX 78521

Posts: 2,384

RE: Fuel Types?

It may perform better and increase MPG on regular. If you have a 4 cylinder engine there's zero benefit above 87 octane.

09-17-2006, 02:30 PM

YeuEmMaiMai

Been Around A Long Time Member

Join Date: May 2006

Posts: 1,905

RE: Fuel Types?

what model of car? unless you got mods or a type S motor, 87 octane is all your engine requires. Using a higher octane fuel may ADVERSELY affect performance. Prime example is the J30a that looses 4HP and as much as 15ft lbs of torque when you use anything higher than 87