I don’t know how to reply to each comment so here are my answers (please tell me how to individually reply):
db4690: I’m not getting any check engine lights. So if that addresses your first 2 questions… otherwise, I don’t know the answers.
oldtimer11 and ok4450: okay, but my dad was getting better mileage. I’ll check the tires; thanks. And I’m only getting 16. Could tire pressure account for that much difference?
pleasedodgevan2: It’s mostly city driving; occasional 12 to 15 mile stretch for business errands.