Yeah, regarding the 54 years, I have already posted about that in an earlier post in the thread about the age. There I posted a normal life span of a bus is about 12-15 years or 250-300k miles. It can be considered to work 20 years more with a full renovation, engine change and new body, but that is almost like a new bus. Also that would be a maximum of 35 year and not over 50.
I also agree with only diesel and no CNG. The corruption we al know about, where I also in a bus accident thread I posted about paying for passing inspection before they had it in the news today. It´s all wayward and backwards.