Just adding this relevant tidbit to the thread for further consideration:
Toyota's latest Avalon was designed with weight reduction as a goal. It is 110 lbs lighter than its predecessor, which permits narrower tires to retain acceptable grip:
Quote:
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“Less mass makes Avalon more responsive and engaging near handling limits,” Katarzynski [Program Manager of Avalon Vehicle Development] explained. “Also, with less mass, less tire width is needed to reach competitive grip levels. The smaller width helps minimize drag losses to help enhance fuel economy, too.”
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Source:
Toyota's weight reduction strategy makes 2013 Avalon lighter, more fuel efficient