hi-
most places in the u.s. & canada that i've been to
that are pretty close to sea level usually have three
grades 87, 89 & 92 or 93 [r+m/2 method]. some places
are exceptions, like this one station i was in in
missouri once that had five grades between 87 & 91 [i
don't know why], or some sunoco stations out east that
sell 86 octane 'economy' flavor [so you can save a
whole penny over regular].
also, typically, as the altitude gets higher, the
octane drops off slightly because the air is thinner
and pre-detonation isn't as much of an issue. [the
trick is to make sure you burn all of it before you
come back down to 'normal' altitudes. ask me how i
know...]
i'm at around 500 feet above sea level here in
chicago, and burn 93 most of the time in my bone stock
'68 440. periodically, i'll top off with 89 if i've
got more than 5/8ths of a tank left, and am yet to
have an issue with pinging. i think a lot of it's
subjective, though, and has to do with the car, the
brand of gas, altitude, climate, et.c., but the
general rule of thumb i stick with is burn premium
fuel in a truly premium automobile. of course, with
gas prices creeping up here in the states, i can
empathize with what it must be like in europe...
take care,
--jason
jason reizner
chicago
68 crown hardtop
>Hi, i just wonder what are the different octane
>number gazolines you have in USA ? I know that >the
US octane number is different than french >(RON)
number and seems to be (RON + MON) / 2, so >a 98 RON
(= 88 MON) would be a 93. At this time i >run my '57
Imp with unleaded 98 RON (so 93 for >you) and i want
to switch to 95 RON ( = 90 US >gazoline, don't know if
it exists..).
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