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05-08-2009, 09:57 AM
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#11 |
 
Drives: Yaris Join Date: Apr 2009
Location: USA
Posts: 355
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higher octane fuel is a cleaner ignition assuming you have a healthy ignition system (all components). Other than than...one would really be hard pressed to tell the difference between an 89 and a 91 in a Yaris. It's a low-mid compression motor with 100hp. I can possibly see smoother starts but as far as running and gas mileage....we all know that the higher octane provides no benefits.
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