octane rating and engine performance
In Texas, the minimum octane rating is 87. On a recent trip to Glacier, I noticed a lot of the fuel in states like CO, WY and MT, the octane was 85, and you had to buy the mid-grade to get 87 and abov...
Forum Discussion
coolmom42 wrote:patperry2766 wrote:
In Texas, the minimum octane rating is 87. On a recent trip to Glacier, I noticed a lot of the fuel in states like CO, WY and MT, the octane was 85, and you had to buy the mid-grade to get 87 and above.
Will 2 octane point decrease really make much of a performance difference?
No.
The lower octane rating is available at higher elevations. At that point, the air density becomes the limiting factor in engine performance. Extra "octane" is a waste in engines that don't require it. (Just like anything above 87 is a waste in engines not designed for it.)
Totally agree. I have found no difference-except price- in performance or mileage of 85 octane at our altitude. my vehicles run fine.
