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Pleasantly surprised that my efficiency is not that much worse going form 19 in to 21 in. Over 4000 miles I was averaging 364 wh/mi on the 19 in slipstreams with the 245/45/19 tires. With 1000 miles on the staggered 21's I'm getting 277 wh/mi wrapped with 245/35/21 and 285/30/21 Pilot Super Sports so they're about 4 percent less efficient.
