A gas station is now selling Dart 100 Racing unleaded. I was thinking of putting some of the 100 octane unleaded in my 2002 Celica. The car runs great on 87 and the owners manual call for 87 or higher octane. I was wondering if there is any negative effects of mixing a few gallons of 100 octane into my car. The car has a compression ratio of 10.5:1.