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Old 11-23-2012, 07:39 PM   #17
Brabs_Weather
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Found this for you od the svtperformance website

Research Octane Number | | Motor Octane Number | | R+M/2
ethanol...........118....................96....... ................107
regular gas .......92....................82................... .....87
E85 (summer)...113....................94.............. .........104
C16.................119.................117....... .................118
Form the person posting:

"As a drag racer I feel the most important number is the Motor octane number. Research and R+M2 don't mean to much to me.
R+M/2 is the number you see at the pump. to get that number you take, research octane plus motor octane and divided by 2.
So you can see where some say the octane of E85 is 113 and some say 104 and some 94. The R+M/2 of E85 is 104"
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