Quote:
Originally Posted by AutostradaVR4
when i was in OK City for training all they had was 91 and it made my car run like garbage and smell terrible. Tried different brands but didnt do any good. After the first few fillups it eventually started running smoothly, but still felt sluggish like it was down on power and still smelled. Maybe the ECU has to learn what fuel your running or something?
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I think it was in your head.
The air is thinner, ie less oxygen, so less oxygen means less fuel needed.