Quote:
Originally Posted by whitevette
You heard correctly...now, go try it! How much do you pump them up? What are they now? If they were mine, I would put in 40 psi ( cold) to start. Worn, damaged tires are "riskier" than newish tires. New tires ( fresh tire cord) get 44 psi (cold). Aged tires get less, since their tire cord adhesion qualities are questionable. Seven years is a "rule-of-thumb" age for tires to become "old".  |
I would agree based on first hand experience. I put the stock tires that had been sitting in storage back on my vehicle after 3 years and after reading many posts on tire pressure, I slowly increased the pressure up to 60psi. My mpg immediately went up 10% when combined with a slight change in driving style. However, months later, one day a particularly nasty speed bump caused one of the steel belts to break and a lump formed on the tire ruining it. Could be just a random manufacturer defect (as the other 3 are still fine) but the tire's age combined with high psi probably helped the failure. They were goodyears and I have now eased the pressure back on the others to 50psi. I would be curious as to others experiences with higher than recommended PSIs.