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  1. Anyone use regular gas in their Si?

    @tinyman392 thx, makes sense--there's a manual for sedans and one for coupes, each including all trim levels
  2. Anyone use regular gas in their Si?

    I'm a new 2020 Si owner and am still on my first tank of gas. I found this old thread and want to add new info with this screen grab from the 2020 manual. It's similar to what has been said but a little more specific. If your car has sport mode, which the Si does, the manual is specifically...


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