I'm fed up with the price differential between regular and premium. Premium now costs 34% more than regular where I fill up. The argument about false economy by losing efficiency with regular doesn't hold up anymore. It made sense when premium was only 7% more than regular, but not anymore. My engine has a knock sensor, so I should be good. I now pay $21 per fillup instead of $28.

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95 E320 Cabriolet, 169K