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Old 08-10-2018, 07:20 PM   #11
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That was my experience in the turbocharged Sonic. Improvement in fuel economy, but not enough for the price. Mixing my own midgrade from regular and premium would have equaled out in the price per mile, but I deemed it not worth the hassle.

A modern car runs just on the edge of knocking by continously adjusting the ignition timing in order to get the best performance and fuel economy. When a regular octane car runs on higher octane fuel, the timing advances as far as it can, which isn't far enough to get near knocking. That is why it may seem to run smoother.
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Old 08-11-2018, 09:55 AM   #12
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I set my ScanGauge E to show ignition timing, and today I was able to see that cruising at 50 - 60 mph with a light throttle results in an advance of between 30 and 36. Now I have nothing to go by on straight 95 RON but when I change back I will see what the numbers are then, and report back here.
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