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
Turtle n Peeps wrote:
You don't need the higher octane in higher elevations because the elevation is limiting the amount of air that gets in your engine. (unless you are supercharged)
Many engines are turbocharged today and the elevation makes little difference in fuel requirements. The OP has a 5.0 non-turbocharged so the low octane should be OK, but Ford Ecoboost engines should have premium fuel when towing, per the owners manual.
