Hey guys I am really considering a 90 - 92 Brougham. I have liked these cars for a long time, but my only concern would be the gas milage. I do more city driving to and from work. So the question is what kind of gas milage do you guys get? Do these cars require regular gas or premium?? And is there a noticable power difference between the 5.0 and 5.7??? Thanks in advance.