That statement is only true up to 1985. Put a Fed SDL right next to a CA SDL and no one but the most knowledgable people will be able to tell them apart.

Figure low 20's for an SD around town. Its a heavy car with out a lot of power so they don't really shine around town, espeicaly with the AC on.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200