tyre pressures economy??

[canis]

I've always over-inflated tyres by several psi, not quite as much as others have stated, but enough to reduce friction. And I've never seen a tyre wear in the middle either. Our V40 has spent the last six years at 'fully loaded' pressure, but still the inner edges wear prematurely. After reading this thread, I think I may go a little bolder in future and over-inflate a bit more.

[Model flyer]

Any police traffic officers on the forum ? It might be worth the input from one of them. Any serious road accident will be investigated by a qualified investigator who take tyre pressure very seriously. Running your tyres outside the recommended margins by the amounts some posts are suggesting may leave you open to prosecution if you are unlucky enough to be involved in a serious crash.

[green van man]

41psi is the recommended fully loaded figure given in my handbook.

Paul.

[Billggski]

I live by an accident black spot, several fatal crashes. I've had three cars in my hedge in the last 18 months, one mini upside down on my greenhouse.
The police have not shown the slightest interest in the tread, make or pressure of the tyres.
That said, I always run at recommended pressures myself.

[RoyMacDonald]

It's a pity mythbusters didn't check the braking distance for the different pressures as well on the car. It's been done with bike tyres and it didn't make any difference to braking distance regardless of pressure and we are talking 140 psi plus.

I notice that the contact area for the standard mentioned above is that at 100 psi test pressure the contact patch does not vary by more than 5%

Roy

[tt82]

You also have to consider bump absorption. A low pressure tyre will absorb bumps and mould to the road better than a high pressure tyre.

[Cantankerous One]

FIW I run mine on 34.5 front and 34 rear - even wear across tyres and smoooooth ride.
Fuel consumption as per signature.

[RoyMacDonald]

Originally Posted by tt82

You also have to consider bump absorption. A low pressure tyre will absorb bumps and mould to the road better than a high pressure tyre.

But allow more sidewall flex and give worse road handling.

Roy

[green van man]

Landrover discovery 1, recommended tyre pressure, 26psi front 36 rear.
Car is a pig to drive and front tyres have their shoulders worn at a visable rate. 34/36 psi is required for the front tyres to wear square. I run mine at 36 front 42 rear, all tyres wear square grip is excellent even off road on wet rocks and handling predictable. Having driven at recommended pressures, other than landrover having shares in tyre companies I can think of no reason to recommend them, in fact my car stops quicker at my pressures with bf Goodrich at on than it did at recommended pressure with the camac tyres it came with on. Because the tyres wear the shoulders so quickly folk were putting the cheapest they could find on which did nothing at all for the safety of a 21/4 ton vehicle.

Paul.

[Clan]

Originally Posted by tt82

You also have to consider bump absorption. A low pressure tyre will absorb bumps and mould to the road better than a high pressure tyre.

That is the job of the springs and dampers ... A high pressure tyre performs better in the rain too .Less likely to aquaplane . a soft squidgy one will trap water in the middle .