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
shelbyfv wrote:Lynnmor wrote:Thanks for posting this. I have a trip to the Rockies coming up and I have to admit I've never read the manual. I'll avoid the 85 octane. I have no credentials that would justify me second guessing Ford.
Some fuel stations, particularly those in
high altitude areas, offer fuels posted as
regular unleaded gasoline with an octane
rating below 87. We do not recommend
these fuels.
If you knew how ICEs worked you wouldn’t worry about second guessing anyone. If naturally aspirated, an engine, in general needs less octane with lower air pressure (altitude) for a given set of parameters. 85 is a fine sub for 87 at altitude.
Do you think they magically sell “bad” gas in the mountains?
