Well, when the CE light first came on I had about 1/8 of a tank (nearly empty) but the cap was tight. I have the "one click" snap cap, so I know it was on okay.

When it went off, I had about 3/4 tank of Chevron reg. unleaded (87 oct.) and have been using Chevron gasoline since.

I will keep that in mind about AutoZone, if they'll pull the codes. Thanks for the tip, marragtop. People I have mentioned this to said it is rare for a check engine light to reset unless it is manually reset. Not sure if this is true, but only what others are telling me.

I know shops make big $$ on cars now, for diagnosining the CE light. Sometimes miss the days when a good tune up will keep your car running good, without any unexpected worries.

Ed