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I do a lot of hiking, and a fellow hiker has a Ford Excursion (huge SUV) who routinely has 65psi in his tyres (recommended for 45psi) having measured an increase in fuel economy by ½ mpg (more than that at 45psi) which for him is about 5%
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"There's no tellin' where the money went"
-- Robert Palmer, "Simply Irresistible" (1988)
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