"B2431" wrote in message ...
I've heard of them doing up to
150 octane (I don't know how that's chemically possible, but that's
what they say)

It's not based on the hydrocarbon octane anymore. Most automotive gas pumps
have the formula decal.

Well, it never strictly had anything to do with how much octane you had anyhow. It
is the performance (with respect to detonation) compared to isooctane.