89 octane premium fuel necessary??
Banned
Joined: Nov 2005
Posts: 3,739
Likes: 8
From: MD
My manual for my 05 says 89 recommended 87 ok. You won't be able to put a half a tank of 89 in and tell a difference but over a long period of time you will come out better. The engine will run cleaner and with that run better and you ain't talking but a buck or 2 difference on a fill up. Now if you are running a tuner you should run what ever Octane is recommended for the tune you are running.He got a programmer at 45,000 miles, but the truck ran fine up until that point.
Veteran
Joined: Jan 2007
Posts: 413
Likes: 1
From: Oklahoma City, OK
In Colorado we have 85 (low grade), 87 (mid grade) and 91 (premium). I've always been told (right or wrong) that due the altitude 85 was equivalent of 87 in the flat lands and that 87 was the equivalent of 89 and so on.....
So would you run the mid grade 87 or premium 91. 89 Octane is not an option I have found.
So would you run the mid grade 87 or premium 91. 89 Octane is not an option I have found.
If you are worried, I'd buy half a tank of 91, and half a tank of 87. The gas station doesn't care...
