I used to use crown and the cheaper no name brands. I switched to mobil and seemed like it put a new life in the motor. Less hesitation and pull smoother pull the the redline. About a month ago I switched to Sunoco ultra 94, have been using it ever since. Its about 10cents more a gallon but since our cars run extra hot, its nice to have a higher octane to cool the engine down.
Also i recently switched out to a hotter spark plug and it gives me a piece of mind.
Also i recently switched out to a hotter spark plug and it gives me a piece of mind.