Originally Posted By: pitzel
I jack my 32psi-rated tyres up to 40psi. Like the slightly stiffer ride, and I'm sure it gives me an extra few MPG.
The door sticker is to protect the manufacturer from extreme conditions, ie: some dodo that drives in the +120degF heat, at maximum gross weight, and travelling 100+mph, from tyre failure.
You've got that backwards. Higher pressures would do that. Lower pressures are usually for a more compliant ride and perhaps even wear. Higher pressure means lower rolling resistance and less heat generated.
I certain value CapriRacer's input, but his was not a blanket recommendation that the manufacturer's recommendation is the final word. Most people don't install OE tires, which changes the equation quite a bit.
I jack my 32psi-rated tyres up to 40psi. Like the slightly stiffer ride, and I'm sure it gives me an extra few MPG.
The door sticker is to protect the manufacturer from extreme conditions, ie: some dodo that drives in the +120degF heat, at maximum gross weight, and travelling 100+mph, from tyre failure.
You've got that backwards. Higher pressures would do that. Lower pressures are usually for a more compliant ride and perhaps even wear. Higher pressure means lower rolling resistance and less heat generated.
I certain value CapriRacer's input, but his was not a blanket recommendation that the manufacturer's recommendation is the final word. Most people don't install OE tires, which changes the equation quite a bit.