Quote:
Originally Posted by lumberjim
Have you ever analyzed whether it's cost effective to use 89 or high test?
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The BMW study was rather disappointed to discover increased engine wear with higher octane.
However one near 40 MPG tanks a previous summer ago was after an accidental fill up with Exxon high test. But it was also ideal conditions - mostly highway on a hot and humid days. That created a curiosity. But insufficient numbers exist to say more.