Message text written by Barry Schwartz
>Try regular, if it doesn't knock or ping under load (try a fourth gear low
rpm, say around 2000 RPM almost full throttle acceleration) then your fine.
<
Gasoline formulations using tetra-ethyl-lead had a tendency to ping worse
at low RPM's but the newer formulations can perform fine at low RPM but
ping at higher RPM* so test through out the desired RPM range.
Dave
*this phenomenom was noted on a 79 Mustang when I took off the catalytic
converter and tried a tank of leaded gas (back in the 80's when you still
could get it) and I noticed a pronounced low RPM pre-ignition that was not
present with the unleaded gas which tended to ping at the 4000 RPM range.
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