Calculations of octane for US market (and others using the formula
Pump octane=(R+M)/2

R=Research Octane Number(RON)
M=Motor Octane Number(MON)
If MON is 83 (typical)
91RON = 87 averaged
96RON = 89 averaged

Jimt

> 85-87? You run on kerosene?? No wonder US-market
> cars have detuned engines! Outside the US some
> cars still require 96 octane or more. Some cars
> will run on 91 thanks to their management
> systems, but these cars DO suffer some loss of
> performance as a result due to the resultant
> retarded firing.
> 
> You might guess that NZ has 91 and 96 octane;
> Shell has just started offering 98.Irrelevent to
> most listees, but for interest the price
> difference here between 91 & 96 is about 4�/liter
> NZ, or about 3�US, which is hardly going to break
> the bank.
> --
> Andrew Grebneff
> Dunedin
> New Zealand
> Fossil preparator
> <andrew.grebneff@stonebow.otago.ac.nz>
> Seashell, Macintosh, VW/Toyota van nut
> 
> HUMANITY: THE ULTIMATE VON NEUMANN MACHINE
> 
> DEMOCRACY: RULE BY THE LOWEST COMMON DENOMINATOR
> 
>