will LA block huggers fit a magnum?

jimjimjimmy said
your rpm at 60 mph would be no more than a fast idle it would get great mpg .

Well, there is no 60's in AZ as all the main hiways are 75 but that means everyone does 80+
I get right at 25mpg at 80mph at 2,100rpm with a 400hp 5.9 Magnum.

Heck at 60 I'm just going into OD. :D