i hope she at least got out to look that they weren't completely flat from a nail.

i would say if they weren't visibly flat, you were ok

 

Probably fine. For every 10 degree change the tire pressure changes by 1 psi. So if the tire pressure was correct at 80 degrees, they would be almost 8 psi lower. Unless filled with nitrogen.

 

I would have had her visually inspect them. I filled up my tires last week when it got cold here.

 

All it takes is one low tire for the TPMS light to come on. Hopefully you checked all the Tire Pressures.

When the cold weather hit, I set my TP to 36 at about 40F when cold (undriven). The tires heat up about 2 degrees during a drive, and I see 38 or 39 psi after a drive at that temp.
This morning, -2F, and the TP are about 33.5. Even though the tires were all initially set to the same pressure, within the 0.5 degree accuracy of the hand held tire gauge anyway, I have one sensor that usually reads lower.

 

I suggest you take the time to check your tires and oil once a month. You can't tell by looking at a tire unless it's very low. If you spend thousands of dollars for a vehicle, I think it deserves to be looked at occasionally. Course I spent 35 years working on military equipment where Preventive Maintenance was stressed so I may be biased.

 

Where did I say I don't check my oil or tires? Don't talk about "Preventive Maintenance" to a retired farmer.

 

...... Was I right?

It's the day after .... you tell us (please)

 

No response = Wrong

 

Curiosity satisfied, thanks! Mainly just glad to hear that Mrs. MoneyPit1946 didn't have any big adventure

 

When tyres are new they're fitted onto the wheel and would have normal air inside them (dry air is apparently 78% nitrogen), then they'd get pressurised with the pure nitrogen. So is there really much advantage to it- especially if you don't "top them up" with pure nitrogen if the tyre pressure drops?


I was going to buy the proper Ford "in tyre" TPMS sensors and enable the TPMS on my Kuga (it's not law for the system to be on vehicles in Australia so Ford don't have it as standard fit.) But the sensors are expensive and the killer (for me) was the lack of a dashboard tyre pressure reading. I ended up with an aftermarket system with external valve cap type sensors (yes they're ugly to look at, but can be quickly swapped to a second set of tyres). It gives me a constant pressure reading for all four tyres and a visual/ audible warning for pressure and temperature faults. I don't consider the temperature feature of much use when the reading is taken at the valve cap.

 

When tyres are new they're fitted onto the wheel and would have normal air inside them (dry air is apparently 78% nitrogen), then they'd get pressurised with the pure nitrogen. So is there really much advantage to it- especially if you don't "top them up" with pure nitrogen if the tyre pressure drops?

Yes it does affect it, unless they purge the tires of atmospheric air at the factory. The air in the atmosphere still contains moisture. A lot of racers use a closed system to "air up" their tires. It purges the tires, then it fills the tires with nitrogen. Adjusting air pressure isn't an issue, because nitrogen is always kept on hand to run the air tools. Nitrogen is highly compressible. There is a lot of pressure in the bottles that most would assume are typical O² bottles. On typical non-race day during the weekend, we can run all the air tools, and do tire pressure adjustments for practice, on one bottle.
My tire guy raced a lot. He offers nitrogen, but uses regular air on his shop trucks and personal cars. Not really worth the hassle of doing it the "right way" for such little benefit for street vehicles. Makes people think they don't have to check their tires anymore.