Quote:
Originally Posted by Photonfanatic
So you shouldn't really go as high as you dare. Cause I dare go maybe... 65 PSI.
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There's no real need to go very high.
On normal passenger car tires, you'll already get most of the benefits around 45-50 psi .
45-50 psi is usually already beyond the specification of the car manufacturer, and into the tire manufacturer's sidewall max. allowable pressure range.
Increasing the pressure further , the effect on your MPG will become less and less noticeable - the law of diminishing returns.
By increasing the pressure further, you can also run into other problems, like a very harsh ride, wheel bounce, the suspension not coping with the bouncing wheels, uneven wear, ... so you need to watch the tires closely when going to or beyond the advertised sidewall maximum.
I run the tires at sidewall max. pressure, winter and summer.
Increasing the pressure beyond that limit, made the rear of the car bouncy, so I backed off a bit.