100 Octane
Safety Car
Joined: Nov 2007
Posts: 4,433
Likes: 873
From: Bay Area CA
To answer your question: No, 100 octane will not hurt your engine just your wallet.
If you wanted to try it out once in awhile, I would fill half with 100 octane and half with 91 octane and see how your car feels.
Last edited by Mike's LS3; Jul 9, 2017 at 02:54 PM.
Melting Slicks
Joined: Jul 2000
Posts: 2,722
Likes: 115
From: Phoenix AZ
Mix the 91 and 100. I do a 10/5 gallon during the Phoenix summer and 9/6 the rest of the year. I'm e-forced and cammed, and had the car tuned at the 9/6 ratio.
So, running and average of ~94 octane and ~$5.00 overall per gallon cost. High but less than straight 100 for 15 gallons but fortunately for me, I don't buy more than that amount a month.
So, running and average of ~94 octane and ~$5.00 overall per gallon cost. High but less than straight 100 for 15 gallons but fortunately for me, I don't buy more than that amount a month.
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,342
From: Gilbert AZ
Whatever your car is tuned for. Like they said above, if it is fine on 91 or 93, which most are, you are just wasting money.
I would do a $16 can of torco over blending if you needed more octane.
I would do a $16 can of torco over blending if you needed more octane.
