Originally Posted by Knightrider03m
But I still stand by the engine running just as well with 87 vs 93 as I drove the SHO in both forms.
Oh, I'd be quite surprised if there was any difference noticeable to the driver when running regular instead of premium in a modern vehicle. I'd be sure that there would be a power loss, but it would have to be a SERIOUS loss (at least 25%, and you'd have to be hammering it even then to notice) for the driver to be able to tell any change on the butt dyno. Most people just don't really ever wring out every last amount of power from the engine; we're usually just using a small fraction, and unless it negatively affects throttle tip in and initial response, we just won't be able to tell when we lose 0.5 seconds to 60mph.