what is the usual IN-Hg VAC at idle?

oh phew.

I was so worried that there was some issue.
When I bought the car it had a number of small vacuum leaks. I've worked very hard to get rid of ANY leaks.
I've installed about 1/4 of the car thus far with all new hoses. I plan to slowly do all of them.

I hear all these things about silicone tubing. Ive bought it just because its easy to work with and I think looks good. But is there any real truth compared to just regular vacuum tubing really? Heat dissipation?

Ive actually done a ton of searching and not really come up with anything