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MYP 295/35/21 and 275/35/21 tire size options and Reduced efficiency?

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I'm currently running the stock 275/35/21 tires in the rear, and 255/35/21 in the front. I know many people in the forum mount the rear tires into the front and purchase 295/35/21 for the rear. This helps protect the wheels from curb rash better, and potentially better ride. However, what is the efficiency impact of doing this? With my driving habits, I am getting around 280s Wh/mi with the stock 21" Uberturbines.
 
 
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