What is everyone setting their PSI in the tires to?
In an effort to squeeze more MPG out of my W210 these days...I have increase it to 40 ish PSI instead of mid 30's. (the max on the tires says 51 PSI) but I don't feel comfortable going pass 45 PSI.

I am running General tires (which I like for the price and they look decent)
235/45/17

It would be great to hear to the averages.... please specify the tires size so I can compare apples to apples.

 

I run 215/55/16 stock rubber at 30psi front and 32psi rear. I get 31mpg in commute traffic.

With your wide rubber and increased pressure expect to wear the centers out in a hurry.

 

you have put on the car.
So maybe 40's is too much PSI.

 

Do the math on your increased psi vs mpg gains and then factor in the decreased lifespan of rubber and see how it plays out.

I expect it is not cost effective and may not be too fun in the rain either.

 

For sure tires are not cheap either...

 

235/45/17s. 36psi all round.

 

38 rear and not much difference in ride quality and about 1-2 mpg more.It won't hurt tire life to bump them up 6-8 lbs over stock
.

 

I use 29/32 to compensate for low profile 17" tires and ride quality. I still get 19/28 mpg. I would raise pressures if I was hauling a load.

Personally, I think you can do more with adjusting your 'driving style' than manipulating tire pressures. Good luck.

 

I don't give a crap about fuel economy, raising tyre pressure is all about improving cornering grip and stability as far as I'm concerned.

Not sure where the "not much fun in the rain" comment comes from either - have a read of this article http://www.tirerack.com/tires/tirete...e.jsp?techid=3 to see the extra contact patch you get in the wet with properly inflated tyres.

 

The point of your post and article you reference escapes me.

The article speaks of "proper" inflation and shows the weakness of under inflation. Says nothing to back up over inflation which was the OP's topic. Over inflating you ride the center of the tire and the footprint becomes smaller and harder, reducing its ability to grip in slippery conditions.

 

And the point of your post escapes me as well - mistertonyn asked what psi people are running - nothing more. I don't consider 40psi to be "too much".

Regarding your "smaller and harder" contact patch with more psi....well, that's up to you to decide.

 

season to improve tire contact to pavement.

 

I run 37-38psi in the front with a 245 40 18. It the rear I'm running 39-44psi with a 275 35 18 Michelin Pilot Sport A/S. They have a softer sidewall so the higher psi suits my driving style better. The ride to me is not harsh at all I regularly return 22.5MPG in the city on summer mix.