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...from the number crunching I did, that "flat" spot (contact patch) area on the bottom of the tire roughly equates to a 3% reduction in the mathematical radius of the tire.
...I got ~97% values for the 16" diameter Goodyear, Firestone/Bridgestone and Michelin tires that I analyzed.
...how'd I do it? Just backsolved from their posted tire-revolutions-per-mile against their published static (unloaded) tire diameters.
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• 2011 Chevrolet Cruze LTZ 1.4LT 6A
• 2009 Pontiac Vibe 1.8L/SIDI 4A
• 2004 Pontiac Vibe 1.8L/MFI 4A
• 2003 Ford Focus ZX5 2.0L/Zetec 4A
• 1971 Dodge Charger 318 3A
• 1970½ Plymouth AAR 'Cuda 340/6BBL 4M
• 1968 Dodge Charger 383 3A
• 1967 Plymouth Barracuda Formula S 383 4M
• 1965 Plymouth Barracuda Formula S 273 4M
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