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Usually ... since the ignition temperature of premium fuel is lower than the lower octane rating fuel, the engine runs a bit cooler. I have a VW Jetta Mk IV 1.8L Turbo vehicle and it uses premium fuel - at an average of 20 cents higher than the lowest octane fuel price, it only adds another $2.50 to my total fill up at the pump ... no big deal, really, especially considering the expert performance I get from that engine.
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