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[churp]

You must have a different owners manual, mine states:

SELECT OCTANE RATING 87 (RESEARCH OCTANE NUMBER 91) OR HIGHER.

This is page 178 in my owners manual. Obviously they know what a few of us are trying to pass on here!!!!!!!!!!!!!!!

The tests have been done before higher octane was ever put on the market (probably the 30's). The ECU has taken the "must have" higher octane in your car away....but it hasn't removed the fact that performance and milage will improve in most engines with it. Note that I am not saying it is cheaper to put the higher octane in....but where I live it's very feasable (Iowa and South Dakota 89 octane is the same price or cheaper than 87, and in Minnesota I get 89 for 2 cents more than 87) and I use 89 octane.