Quote:
Originally Posted by Cunningr
Our low octan gas here is 95 but I honestly can tell the car runs better on the 98 not really power wise but just smoother. I usally put high octan every other tank full. But I dont necassarily beleive its a required. You need to spoil your baby sometimes  |
Not sure where you're at, but you're probably looking at RON numbers. Not the same rating scale. (Unless you're regularly buying fuel at the racetrack).
From wikismedia:
"Another type of octane rating, called****Motor Octane Number****(MON), is determined at 900 rpm engine speed instead of the 600 rpm for RON.****MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, higher engine speed, and variable****ignition timing****to further stress the fuel's knock resistance. Depending on the composition of the fuel, the MON of a modern pump gasoline will be about 8 to 12 octane lower than the RON"
RON is more common worldwide, but RON has been the US standard for a long time. (Though we're beginning to see RON listed at many US pumps)
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