The current number is lower than the old number that included only the Research method. The current number is lower because it uses the average of the Research and Motor numbers. I added to the thread several pages back by now that the "new" method R+M/2 is 4-5 points lower than the Research method. BUT, other things being equal, in other words ignoring the improvement in todays gas over that of the 50's, research octane is about the same. TV says that the operators manual for the 706 says 93 octane (someone check that in their manual) -- that is the research number. Todays research number for 89 octane gas is also 93 maybe 94. Current 87 octane has an R number of 91 or 92. Motor will always be less than research, so the end result is that the current octane number posted on the pump is less that what would have been posted in the 50's -- if such a number was posted them. 93 octane on tdays pump would have an R number of 97 or 98.
This post was edited by CNKS at 18:12:39 10/21/11.
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