I've been running Shell 91 octane in my 2002 Supercharged 4runner for the past 2,000 miles. It would ping like hell merging on to the freeway, or anytime I gunned it. Now I'm using Unocal 76 91 octane. Under the same conditions, there is now little or no pinging. Am I imagining things here? I keep hearing "gas is gas". Could it be the fact that Unocal has no MTBE in their gasoline? Any of you 4runner owners out of California have a gas station you swear by? Or is gas really just gas???

<small>[ March 05, 2003, 09:29 PM: Message edited by: 2runnerd ]</small>