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      07-29-2021, 01:45 PM   #21
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Drives: '08 M Roadster
Join Date: Oct 2007
Location: NJ

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Originally Posted by JamesNoBrakes View Post
Does your truck actually recommend premium?

Itís the high compression high performance engines, often turbo, that do.

I would wager that most people on this site have cars that recommend premium to prevent knock due to the high performance aspect of their engines, vs people that have lower performance engines that do not recommend high octane (because it doesnít do anything).
Yeah, although these days you never know what ECUs are working in a sort of adaptive range where they will advance timing if possible under certain conditions. It seems like some BMWs will do this if you run higher octane for a while. I wouldn't expect a Subaru base 2.5L NA engine to gain HP from 100 octane, but you never know if they benefit a little bit up to 91 or 93 despite being rated for 87.
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