Since you purchased a GT Turbo I assume you want to get [u]optimum performance</u> from your car--use premium gas (91 octane or more). While you can use regular gas in the High Output Turbo premium fuel is recommended and should be used to obtain maximum performance from the engine.
I have been using Chevron gasoline for over 30 years and have been totally satisfied with it. Chevron has an additive--TECHRON--which works to keep the inside of your engine clean. In my GT Turbo I use Chevron Supreme gasoline (92 octane) all the time whether or not I'm driving in the mountains or not. Chevron gas has worked for me! [^]
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