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"Do You Need Premium Gas?" (Up Front, December 2008) doesn't talk about octane numbers. I checked my owner's manual, and it says to use 87 octane. Where I live, 87 octane is plus (midgrade) gas, whereas in most of the country 87 octane is regular grade. Why?
Jim Springer
Idaho Falls, ID
At higher elevations, octane ratings are lower because ...