Quote:
Originally Posted by Icefsh
Wondering what octane gas to put in my V6? Here in the mountian states the minimum regular gas is 85 octane, midgrade is 87, and premium is 91. When I go to states with lower elevation the octane is higher than here. What difference does elevation make? Did not notice any problem with 85 octane (only 1 tank of gas). But 87 octane seems to run better. Only 730 miles now.
|
85 in Colorado is equivalent to 87 at sea level. For cars that recommend 87 or better, 85 is acceptable at altitude. Same for the other octanes. If your car needs 93 or better, 91 is equivalent at altitude. Many people don't know this and waste their money buying mid grade or premium when they don't need it.