Quote:
Originally Posted by andrewwynn
The engine is designed to detect the knock from predestination, the result is usually less power.
With my m54 i lost enough mpg with 50/50 87/93 that it wasn't worth it. The one time i put in 87, (out of fuel due to a stuck fuel float), i forgot to tell the person bringing gas to bring premium, the engine misfired on the initial launch to freeway speed and i got to limp mode to gas station.
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I really cannot sense any difference. But I also don't drive this old bitch hard either. I need it to last a few more years.