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Running tire pressure at 45 psi or higher increases danger of loss of control, bouncing and the suspension is NOT tuned for it. It can affect stopping distance. Plus the tires will not last as long.
Last time I checked last fall, about the cheapest tires out there for a GEO for instance were around $50 each and rising. Saving $75 dollars over a year on fuel you would probably burn more than that off the overinflated tires.
Different story for engineered, lowered rolling resistance tires. You will save approximately as much in fuel as the extra cost of the tires. So it is a break even.
Enginator
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