Would there be enough gains in 89 v 87 octane to justify going 89 octane.

My truck is stock with 305/40r22 and 22x9.5 wheels.

Let me here your opinions?

 

Personally, I'd just go 87 or 93.

93 octane usually gives you better gas mileage so for the added cost it's worth it, almost. Once you factor in the added power it gives you, it's really worth it.

 

I have an 87 tow, 87 performance and a 93 performance and they suit me just fine.

 

It's a lot cheaper just to add some E-85 to your 87 octane. You can get any octane you want- up to 105, for cheaper than the 87.

 

and lose about 10 miles per gallon, and if it alreay has 10% ethanol, you may be causing some deterioration of the rubber parts.

 

Where do you guys get 93 octane?

 

It's at every station in Texas. 87,89, and 93.

 

Every station in Florida too,87,89 & 93.

 

exact same for georgia. well, at least around here.

 

In AZ it's 87, 89, and 91. I've never seen a gas station with 93 before.

 

Then I would get 87 and 91 tunes. The canned tunes in the Edge and the Gryphon are for 87 and 91.

 

Me?

 

What rubber parts?

I think it has something to do with your elevation, and the fact that it lowers your compression, hence reducing the probability of knock. In other words, there's no need for you to have any higher octane than 91.

 

O rings in the fuel system, plastic, synthetic, whatever.

 

All hogwash. Cars sold in the USA have been required for 20+ yrs to be compliant with fuels containing fairly high concentrations of ethanol. E-85 doesn't hurt any "newer" vehicle. Now if you go put it in a 70's vehicle, you might have problems. The only hardware problem you have to worry about when running the stuff is maintaining proper a/f ratio. Even acedic acid isn't a problem.