What is the rpm sweet spot for highway driving

You don't get it. I don't HAVE a problem because I don't WANT to speed. Get it?

I didn't mean YOU had a problem not wanting to speed, the "problem" i was referring to was it being costly.

I almost forgot i read a book once written by a retired highway patrol officer basically explaining how to speed and not get caught. He is not embarrassed at all to state the speed limit and traffic ticketing system in our country is baloney which is what inspired him to write the book in the first place.