Quote:
Originally Posted by qx4dude
Also,
3) Assuming higher PSI = better FE, why do most auto makers choose a door sticker PSI number approximately 30% less of max sidewall pressure. If tires are designed to handle 200 PSI, wouldn't raising the pressure be the first place they go to help their cars achieve CAFE standards?
And don't say "it's a conspiracy".
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It's all about comfort. Even at 45 PSI, the ride becomes more rigid. You feel more bumps. Low pressures absorb some of the bumps so less is transferred through the suspension. Consumers would complain about the rough feeling ride, they would not sell cars.