I usually tell them and leave a note on the dash to not adjust air in tires and they sometimes do it anyway.

 

Always 40 psi here, cold. Lexus already rides soft enough. Extended tire life and better handling are the benefits. Haven't checked the sidewalls, but tires are usually good to about 50.

 

Over inflating will get you better mileage but not increased tire life or better handling. Depending on how overinflated (a pound or two won't be noticed), both tread life and handling will be worse because you're driving on a smaller contact patch.

 

Some people are just going to do what they do, no matter what.

 

Presumably he meant nitrogen which is actually beneficial for tires in climates that have widely variant temps

 

https://www.consumerreports.org/tire...s-a6260003694/ Scam. Buy a tire gauge and learn how to use it. I even taught my kids to do it.

For the TL;DR crowd...We filled one tire per model with air and another with nitrogen. Both were filled to 30 psi (pounds per square inch) at room temperature. We set both tires outdoors for one year, then checked the inflation pressure at room temperature again.

Both tires lost pressure over that time, but the difference in loss was minimal. The average loss of air-filled tires was just 3.5 psi from the initial 30 psi setting. Nitrogen-filled tires lost an average of 2.2 psi.

The results show that nitrogen does reduce pressure loss, but the reduction was only a 1.3 psi difference from air-filled tires over an entire year.

ONE YEAR - 1.3 PSI difference.

 

ha ha it was a joke ...

 

So, a question for those that get their tires nitrogen inflated. There is air inside the tires before they pressurize it. Does the dealer vacuum that massive amount of air out of the tires and then replace it with air?

Otherwise what exactly are they charging for?

For me personally it is like bottled water that is filed with filtered tap water vs. filtered tap water out of faucet..... Just my personal opinion, I know others might disagree.

 

$5 for each green tire cap.

 

Costco has it for free. Makes it worth it.

 

I finally got around to bleeding off some pressure in my 350h tires, and the difference in the ride is shocking. I thought that I might notice a quieter ride, but how could it possibly get any softer? Well, it did—very noticeable difference. Went from 41psi to 33psi.

 

I'm running 37 on my 21" wheels.