As an FYI for everyone, I just had my TPMS light come on this morning. I've only had the Rogue for 1.5 months and didn't feel the need to check the tire pressure as of yet. As it states in the manual that the TPMS is not a replacement for proper pressure maintenance...they couldn't be more correct. I had one tire at about 28psi and the other 3 were at 30psi. This is way under inflated, so the monitors are not very accurate, I think for most people, you'll only see the TPMS light when you have a flat.

On a high note, after realizing how low my tires were and slightly hyper inflating them 34/35psi, I reset my fuel eco computer. After driving a typical 50k, I appear to have gone from 9.6L/100K down to 8.4L/100k. That was in heavy traffic on the highways in Toronto. Woo Hoo!

If I am not mistaken, the TPMS will not illuminate until there is at least a 5psi drop in pressure. The first cold snap that we got up here in Barrie my TPMS light came on and sure enough, all my tires were between 25 and 29 psi. It is quite commone for a sudden onset of cold weather to do that. Since then I check my tires regularly and all has been fine.

That is why I put my tires at 42 psi: the TPMS light will only come on when I will have a flat, and I gained at least 0.5 LHK having the tires slightly overinflated.

And it seems the wear is less and more uniform when you over inflate your tires. This part, I don't know yet.

I have to respectfully disagree with you Pescakl1. As a retired accident reconstructionist, I have seen many accidents caused by both under and OVER inflation. Below is a quick explanation from Michelin.

"The Michelin engineering team ran a computer simulation on a family car with pressures increased to 44 psi from the proper 35 psi. They report, "Increasing inflation pressure can negatively affect performances such as handling, wear life, worn appearance and braking traction. For instance, our modeling simulations predict, with an increase from 35 to 44 psi, up to 6-per-cent degradation in stopping distance can occur on wet/dry surfaces."

To put that in context, a Chevy Cobalt travelling at 110 km/h takes about 49.8 metres to stop. An increase of 6 per cent adds another 3 metres to the distance – three-quarters of a car length.

The Michelin report concludes, "The key learning is that inflation pressure affects the tire-vehicle interaction, and the only correct inflation pressure for proper balanced performance is what is specified by the vehicle manufacturer on the placard. Never exceed the maximum inflation pressure, as branded on the sidewall of the tire."

So, in other words, the higher you increase the tire pressure above the recommended pressure, you decrease the contact footprint of the tire, which increases stopping distance and seriously effects lateral handling. IMHO

That is the part that I don't like: Why a computer simulation?

Was it too hard for Michelin to get two cars, same model on the same tires, put them on different tire pressure and do a 100-0 kph stop to see the difference? If the difference is about 3 meters, it should be obvious to notice, right?

On the real life experience, I always heard problems with under inflated tires blowing up, never ever on slightly overinflated (maybe not so many people drive with overinflated tires).

If yo go on a hypermiling forum, that is one of the first recommendation to improve fuel economy, and they write that, contrary as manufacturers say, it is safe to do that, and that the wear is more uniform.
I believe that, by now, if it was not true, you would have some people telling about it.

Something that I noticed is that you cannot do it on every car: My wife previous car, 2006 Civic sedan, was really pressure sensitive and you had to keep it at the right pressure or it was almost undrivable.
On the Rogue, from my experience, the handling is the same, car behavior is the same, braking distance seems not to have increase (you still have crazy people around you to test that feature), so I will keep it like that.
Notice that I stay 3 psi below the max pressure rate of the tires.

I prefer to have the car tires slightly overinflated than under inflated. that is my choice.
If you like see the TPMS light on from time to time, depending of the weather, that is your choice .

It makes complete sense that extreme over inflation will effect traction and wear as your tire will start to balloon, but I've gone just past the recommended to 35/36 that is only 3 psi above recommend and way below max tire pressure. I did notice I feel the road a lot more (from my under inflated 30), I can't imagine how hard 42 would feel. I would think this would start getting into that realm of losing traction. The inflation amount is based on the weight of the vehicle. A Rogue is very light for our tire size, which is why the low psi. Our tires would start to balloon before a much heavier vehicle would.

I think overinflating your tires optimistically will only produce a VERY small improvement in fuel efficiency, probably too small to even notice. However, overflating significantly to 44 psi for example sounds very dangerous to me, and in winter driving it would be downright deadly. I just read a review in my Popular Mechanics book of different parameters and their effect on fuel efficiency - overinflating your tires was on that was tested and they found (surprisingly to them) that this had almost ZERO effect on efficiency. And these were real-world tests, not computer simulations. Also surprising, they found that slightly under-inflated tires had almost ZERO effect on efficiency as well, and they attributed this to the way modern radials are designed to hold their rigidity more than in the past, but also stated that this is not a reason to ignore tire pressure for maintenance reasons. So I would recommend just inflating your tires to around 32 to 34 psi.

I have just installed winter tires on my car and they are at 35/36psi, ...and I did not like it (too flotty handling for my taste). I will put them at 40/42 psi tonight as I am more comfortable.
About noticing more the roads (and they are noticeable in Quebec), you may be more sensitive than me because I did not notice any difference between 33 and 42 psi (neither did my wife and she is usually sensible to that).

Kerrton, about the fuel improvement, I will say at least 0.3 LHK to about 0.5 LHK, and when gas was at 1.40 $ a liter, I definitively noticed the difference. That is my real-world experience and I know my commute by heart, always on cruise control (same speed controlled by GPS), with no traffic (at least in the morning) to perturb the results.

I think the key is to monitor tire wear both with under and over inflated tires. It wear is even, then you are getting maximum contact with the ground and not significantly loosing stopping ability.

Just make sure you watch for differences in handling, check tire wear and you should be fine.

I over inflate slightly also, usually between 36-40 (depending on how often I check).

Guys, I got a question.
I recently put my winter tires they do not have a TPMS unit on it....a light is lit on my dash NO biggie, My question is when i put back my mags in the spring i did not notice a connection or a sensor that will shut off the light..
how does it work the TPMS are their cables? are their sensors on the brakes?
please help ...