blazing928

From what I can gather, from the above, if your car doesn't have TPM, then the factory sets pressures at max load & speed to cover themselves if someone sits on 100+mph fully loaded for some time. The tyres need to be set higher than 'comfort' , so they protect their butts & yours by running high enough pressures.
If you have TPM, I presume it warns you if you go over speed that your tyres psi's are too low.

Over inflating will improve economy on smooth roads, but actually rolling resistance is reduced off road with lower pressures. Schwalbe, a bike tyre company actually did scientific backed tests with MTB tyres, quite interesting.

Your new diesel will take time to run in, also fuel econ is done with a fresh egg between your foot and the accelerator pedal!

steve_Cayenne

All the difference in the world! "It's not what you drive, but how you drive it."

GregGebhardt

People would be shocked at how much fuel could be saved by looking and anticipating what is going to happen in front of you. Every time you slam on the brakes you are wasting fuel.

But then most people who buy a $100,000+ Porsche have no "eggs" in the floor board.

blazing928

personally on a trip, as i live in a state that books me for going 3kmh over the limit, every highway drive is an economy drive!
We have 1kmh races on the freeway as everyone drives to the GPS speed, and then there are the point to point cameras...

jerry joseph

Very good points,+1 for bringing them up..looking and anticipating are uber important as well as the sign of proper driving skills
Judicious use of the brakes is another crucial requirement
Particularly with ceramics,only a little pressure is necessary in most cases(even during spirited driving)..I call it 'feathering the brakes'
Those PCCBs are a real treat,besides being effective,break pedal is pleasant and thus allows for a very smooth braking experience
Smooth is the way to roll..no matter how fast you drive
Slamming the brakes is a heresy to me.as well as being the sign of someone who does not posses all the required driving skills and should probably not be on the road...
Only time I had to hit the brakes hard on my CT was at Porsche driving in Leipzig(trying to keep up with 911s ) and a few times on the Autobahn(150+ to about 50 asap )
+1 on the 'egg' analogy..excellent way to put it..

Cowboys5

Okay, so I checked all my settings this morning and they were all set correctly - summer 19 inch with partial load. Let the air out down to 38/39 front and 40/41 rear. Quite a different feel already. Going in to the dealership in a couple of weeks to get winter tires installed so will discuss then. Still can't believe they delivered the new vehicle filled to 58/60 psi.

steve_Cayenne

Hey Cowboy. You should ask for that $1000 back that they charged you for "dealer prep" to go over the entire car and adjust the thousands of fine nuances by NASA trained engineers, that can't be done at the factory for some unknown reason.

60PSI sounds like the shipping pressure they use, to avoid flat spotting on the ship from the verticle jostling for weeks without your tires rotating.

I assume they at least got the "remove plastic wrap" done right for that 10hr labour charge?

Cowboys5

Ha, good idea. We'll see how far that request gets me! On the mileage issue, I drive aggressively, but not crazy aggressive. Maybe it's the amount of traffic in my daily commute. All I know is that the advertising here says 1400 kms per tank full of diesel, and I have barely broken 1000kms, just once, when I drove Toronto to Michigan return. That's quite a variance from what's advertised. Having said all that, still loving this vehicle.

LaicepsYdobon

Thanks for the flood of replies everyone. Interesting to see that my car was not the only one that had been inflated to full-load. I happen to speak to my dealer over the weekend and he did acknowledge that the tires pressures were high but he assured me it wasn't a mistake. The specialists prepping new cars are required to fill her up this much. This is pretty much a "cover your butt" move by them in case I did end up driving over 100 mph every day and/or do have move then 595 lbs of stuff in the car. He told me that if I don't plan on doing either one of these I can safely decrease the tire pressure to the comfort setting specified in the manual and have a ride which is much more cushier.

I was browsing around on the iTunes store and I did see that Porsche released an app that is pretty much an electronic version of their manual for the Cayenne. I played around with it a little bit and its just what they advertised it to be; a pocket Cayenne manual with videos. It does have the correct tire pressure details in it; that was the first thing I searched for. This electronic version will also be kept up to date automatically. You can download it from here:

https://itunes.apple.com/us/app/intr...474728273?mt=8

RESP

Hey Laiceps,

Thank you for the link to the app and information!
Have a great drive!

RESP

Rats... app is from US iTunes only...
Who wants to ask PCNA to spread their apps to the Canadian iTunes store??

jerry joseph

+1 and thanks for sharing this link with us
Just downloaded it

steve_Cayenne

Don't despair RESP, you can always go here on your mobile browser:

http://www.porscheownersmanuals.com/mobile

RESP

Thanks Steve!
That worked!