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I run regular gas with my 91 245SE and its v15 ENEM cam. I have run different grades of gas to see if the timing was much lower than base with the autoretard the computer puts in if it detects knock from pinging, but even going to better grades of gas, I didn't notice anything better with performance.
Another reason mine might not ping is that I run the car very hard, and keep the RPMs close to redline frequently, and thus have less carbon buildup in the engine. If the engine isn't used hard, or attain higher temps, carbon can buildup and cause heat spots that will make the engine ping. If you are having pinging problems, and can only get rid of it with better gas, check your spark plugs, injectors, and get some high rpm driving into your schedule. Revving the car in neutral won't do much since there is no engine load, but if you are on the highway, take it out of OD and get the rpms up past 3-4k. If you are easy on the throttle, anything upwards of 4.5-5k RPM won't do any damage to your engine(depends on how decent your oil and other stuff is up to snuff).
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