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Octane Rating Relevancy
How important is using the appropriate octance for the engine in regards to MPG? I've decided to run a small experiment to find out, but I'm definitely looking for any input or experience that anyone else has had with this.
I've got a Toyota Matrix '03 XRS, which has a Celica engine in it. According to the manual, it's supposed to receive 91 octane. I didn't know at first, so I used regualar. Then after talking to my mechanic at the time, I switched to the midgrade. All of my past mileage results have been while using midgrade, and I'm right near the EPA estimated MPG. But as the car nears 100k miles, I've filled up a tank with 93 octane, and I'm thinking about making the switch permanent. I'll probably go with 2 or 3 full tanks of 93 octane gas to see if it raises my MPG at all. Any thoughts or experiences would be very welcome. Thanks!
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woodysweats 
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