What tire pressures are you running?

Which is what I was initially saying? That the loss in pressure is due to air leaking, not temperatures?

 

ok.......let's say that's true......then why, every time the temperature goes down to freezing, my tire pressure alert goes off? coincidence?

 

Of course not, cooler air is denser as well my point was that the tire pressure didn't go down by 15 PSI due to temps alone. Probably more like 10 psi due to leaks and 5 psi due to temps.

 

good point

 

No, it's just slower. Nitrogen Information and Advantages

Even the article you quoted states that nitrogen permeates slower through rubber than oxygen rather than not at all. Nitrogen vs Air In Tires - Why Nitrogen in Tires - Popular Mechanics

 

Air is already 80% nitrogen, 20% oxygen. If oxygen leaked as much faster than nitrogen as claimed by the hucksters, the oxygen would soon leak out of the tires leaving pure nitrogen which wouldn't leak out.

No need to fill your tires with nitrogen, just overfill them by 20% and when the oxygen leaks out you will end up with pure nitrogen at the correct pressure. Either that or the nitrogen peddlers are con-men and the people that believe them are suckers.

 

I run my tires at 40/38 and check them weekly (cold in the morning). I top-up maintain pressures using my bicycle pump (no worry about fuse capacities, or killing additional dinosaurs). A 2 PSI top-up equates to about 30 strokes/tire on my pump for Prius-sized tires, whereas a big SUV tire would be quite a workout. A bike pump is less practical if you're down 10-15 lbs, (unless you're up for a good core workout), but then if you're down by this amount all around, you're not maintaining tire pressures adequately.

Don't forget about the temporary spare while you're at it. Temp spares are 'out of sight, out of mind' and when you need it is a really bad time to discover its under-inflated. If you think your dealer is topping up the temp spare during routine maintenance checks, you'd be mistaken. Most folks are emphatic they must carry a spare in their car, but reality is most spares are not serviceable due to gross under-inflation. Temp spares run 60 PSI and lose air pressure relatively quickly. The temp spare in the 2011 Prius IV I recently purchased was down by 40 PSI! The car was 18 months old and the temp spare pressure was likely last checked in Japan. As you're reading this: walk away from the computer and go check your temp spare pressure right now before you forget. Should you need to use the temp spare down the road; you'll be glad you did. Fair bet its low pressure.

 

I don wanna, n u cant make me, lol besides, I like using coal, nuclear, etc to pump up my tires lol

LG-MS910 ? 2

 

An interesting thought: Nukes for air pressure.

 

Dont forget wind power

LG-MS910 ? 2

 

Hence the sail on my roof. A few more hundred year storms and I may never need to light the ICE again.

 

Lol the PiP doesn't have a spare!

 

Spare-free cars or spares as an option is definitely where automakers are going. If you can ditch the spare and the jack, that's an easy 30 lbs out of the car which is critical for fuel economy. Every pound counts with car makers scrambling for MPG's in the face of stiffer federal CAFE standards. Don't expect to find a spare in your next new car.

I personally prefer a spare for two key reasons:

1. Safety: A spare tire serves as an unparalleled impact attenuation structure for rear impact.
2. Tire emergencies: While an inflation kit is fine for a minor nail puncture in the tread, it's useless for any sidewall damage, or significant hole in the tread area.

I had the opportunity to use the spare in my '06 Prius a couple of years ago on the way home from work. I was on the freeway at speed when my right rear suffered catastrophic loss of air from a significant road hazard where the tire went from full inflation to zero inflation in a couple of seconds. You need to be able to stop immediately (less than 1,000 feet) in such a situation to save the tire, but I was going over 70 mph in the speed lane in rush hour traffic, so I needed to roll it down slowly to get to the right shoulder. By the time I got the car safely stopped, the sidewall was overheated and shredded (internally). An inflation kit is useless at this point.

 

yes, a spare is a good thing.