The question is easily googleable, I've read a bit. What are your thoughts on my car?

Onstar says my tire pressure should be 241kpa, recommended (20 inch run flats). Out of the dealership, I had something like 264 kpa on all four tires but each was off by 5 from the other (Something like 258, 264, 260, etc ), but it'd vary from point A to point B as the tires warmed up of course.

I did my best to get my tires even. Last night two tires were identical pressure, and two tires were within 7 kpa.

This morning, pressures looked different again. Two tires were 238 kpa, one was 236, and one was 240. The tire that was the highest kpa last night was now average in the morning, and another tire was at the higher kpa. All according to the car sensors.

Then I drove the car and the kpa once I got to work was 252 across the board. Totally even, on the nose according to the car.

So my question follows. Am I right in keeping the KPA slightly below 241 for cold (summer) start, and above 241 after a 30 minute drive (at 252)? Or should I aim for 241kpa only after warming the tires up? And how much difference should I allow in pressure between the four tires?

This post was edited by Canadian_Man on Aug 22 2017 11:07am

are you for real right now?

Yes I am for real.

Tire pressure was over by 22 kpa or so on one tire. These tires are thin AF, I can't afford to let them wear out, burst, leak, or become malformed.

Since recommended tire pressure is 241kpa, I imagine I should be within 10 of that. But the question is do I cold start 10 below, and warm up to 10 over... or cold start 20 below, and warm up to being exactly at 241kpa.

Yes it's a picky question. Yes, I think it matters a bit. Yes, I know it doesn't matter that much, and the road, weather, driving habits have more impact than a slight variation in tire pressure over/under recommended values.

This post was edited by Canadian_Man on Aug 22 2017 11:45am

Don't fill them with air and you won't see a change.

what does it say on the door tag?

set it to that, dosent matter if its warm or cold

241kpa is 35 psi which is normal for most cars

that being said, my trucks tires are 33 psi lf 34 psi rf 35 lr and 34 rr and when running for a while all tend to hover between 35-36

My pressure monitors read all over the place
Some are 222 kpa sometimes theure 206 and theyre never all the same...

Never cared in the slightest. And my tires were 600$ american a pop... dont stress the little things bud.(im just as poor as anyone else, 27 yrs old tradesman)

You bought a car to enjoy not invoke panic attacks... i hope?

once the tires warm up on my truck they go from 115-120psi to around 140psi.

on my silverado my tires start at 40ish and hit around 45ish by the time i get to work as long as they dont go below 40psi when they are warmed from driving i could care less what they ride at in the range