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I put 22-inch wheels with 305/22 R45 tires. It is KILLING my fuel economy. The overall diameter is just a tad more (maybe) if not the same but the wider footprint is probably the culprit. I may swap the tires and go with a 285 to see if that helps. Just to be sure, we put the fatories back on and ran a couple tanks and saw an immediate and noticeable improvement. Conversely, when I put the big wheels back on it drops.
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