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I havent yet but after the research I have done I'm going to be switchng to 195 55 r16 they have a slightly smaller diameter and are slightly wider. The smaller diameter reduces rolling resistance and the wider tire increases rolling resistance whereas with 205 55 r16 has a larger diameter and is wider which both increase rolling resistance altho the rpm of the 205s is more similar to stock than the 195s but the 195s put closer to the same amount of resistance on your transe so kind of a toss up but I'm leaning towards the 195s.
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