For myself,this will be my last comment on this topic!
I can find both pro and con on using nitrogen. I know! I just spent intimate time with duck duck go! National testing laboratories documents are harder to find, but they are my preference on such topics.
Anyhow, will a tire last longer using nitrogen in the tires, and will it have a significant impact on your wallet???
In your daily driver, not likely!
On your bus? I don't know, seems that rubber in commercial applications is very low cost! I don't know, but very few that I know of get close to full milage from a set on the old RV!
So you don't wear them out in most cases!
This is what I have seen here. One tire for your bus is what I pay for a set on the trailer,or the truck. I wear out the truck tires long before the 6 year limit, so nitrogen is not All that important.
On the trailers age is the issue in most years, so I can benefit. However when a set can be had for less than one commercial tire! Well!!!
If you break it down to monthly outlay, you might be surprised!
Why?
Carcass life defined by the manufacturers are based on Air filled tires. Even though they warranty the carcass for 7 in most cases,the real safe life is closer to 5, or 6 years. So monthly cost difference between say 5 and 7 becomes quite significant.
I am sure a few here can talk about bubbles or separation, (but I don't want to fear monger here), leading to tire change in earlier than they would like! Others stretch that time closer to 6 or 7! One extra safe year on the scale.is nothing to sneeze at.
Understand that deterioration from the inside increases tire separation. Tire separation leads to blow outs, and blow outs lead to serious damage,or loss of life!!!
To close I will leave a reference:
Why Should I Fill My Tires With Nitrogen? | Drive Home Safe
Think I need a little time off!!!!