Originally Posted by GraphiteGhost
When will all the experts factor in the smart PCMs (Powertrain Control Modules) that are now in todays vehicles?
Lets just run a few months/tankfuls and see if anything bad shows up. If these M112 motors are so 91 octane thirsty, I shudder to think about all the fuel tanks out there that have the wrong grade in them or have a high moisture content suspended in the fuel. Surely 2 points under the
RECOMMENDED octane can be automatically adjusted within the PCMs parameters? Because if it cannot, the 2 points ABOVE the recommended 91 octane must hurt as well. All I see around here in the southeast, is 87, 89, and 93. I refuse to put 1/2 of my fill 93 and the other 1/2 fill 89 (89+93 devided by 2 = 91. That would be absolutely crazy!
After a couple of tanks, I'll hook up the OBDII and see if any DTC's are reported!
You use the word RECOMMENDED here, this is not factual at all. Go outside and look on the fuel door, it does not say recommended - it says PREMIUM FUEL ONLY! In my eyes, premium would be the best you can get, in my case, 93 octane and I will not put anything less in it. Our mitsu endeavor, on the other hand, says premium fuel recommended, so I put 91 or 89 in this vehicle. As stated before, I do not think you are going to get any noticeable issues with a few tank fulls, but after 50K miles of a 87 grade, I can guarantee the guts of your motor will not look as good as mine