It's not a legit question because you're comparing apples to oranges. The test car is a Chevy Cruze which takes regular 87 octane. They're just proving that going over the minimum of 87 doesn't make any performance difference which is true. Lots of people think that premium gasoline is better and so if they put it in a car that takes regular, it must be helping. That's obviously not true and the video proves that.
An M4 requires premium, that's what it was designed for. If you use a lower octane, you will lose power because it will knock and the engine is going to cut power to prevent damage. Going to a higher octane than premium such as 98 isn't going to give you more power unless you tune for it.
Putting regular in an M4 would be like finding 82 octane gasoline for the Cruze in the test video, it's going to cost power. But going over the recommended octane doesn't add power.
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Originally Posted by dmkdrum
not quite sure why some of you think this is such a dumb thread? it's a legit question. especially when testing shows no difference.
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