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04-10-2007, 05:40 PM
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#11 |
 Drives: Polar White Hatch Join Date: Nov 2006
Location: chicago
Posts: 407
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The Yaris has 10.5:1 compression. It must have a extremely conservative timing curve to allow the car to run on regular. My old Neon ran on premium. It said premium fuel recommended. It did not say required. If I put regular fuel in the MPG would go down like crazy and there would be a noticeable power loss.
IMO any car with that high of a compression ratio should run better with a slower burning fuel in. The real test would be to use a obd2 data logger to monitor the knock sensor and timing with regular and premium. I would bet that you will see a lot of activity from the knock sensor and therefor timing being pulled and fuel being dumped.
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