Posted by karl f on October 29, 2007 at 19:35:51 from (172.162.143.154):
In Reply to: what octane gas to run? posted by new 560 owner in ks on October 29, 2007 at 10:04:19:
the manual will likely say "93 octane research method." If you look at today's pumps, they will say "?? octane rating (r+m/2)." There are 2 methods of determining the octane rating, and both seperately will come up with a different number. today's octane rating is an average of the two. skipping the science, today's 91 octane, measured r+m/2 will likely be equivalent or barely higher than 93 octane observed with only the research method. there is a lot of info on octane on the internet. on our farm, my dad cannot justify high test so, i just let it go. changed the plugs on the 656 gasser 18 mo.s after an overhaul, and all kinds of carbon in the combustion chambers!
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