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SPOILER ALERT:
Peakster'll probably be mad at me for posting the results here in the thread, but here's what he observed in an A-B-A test, with a pair of donuts (on the rear) for the B test:
A - 55.9 mpg (US) average (regular tires)
B - 60.9 mpg (US) average (donut tires)
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