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
drsteve wrote:
What coolmom said. Your truck will run just fine on the 85 octane.
BUT.....don't run the tank empty and then fill it up with 85 and then go back down to sea level to actually use the 85 fuel. THAT might not work out too good.
If you will be going back down to lower altitudes before most of the gas is used up, I suggest that you fill with 87.
