I have had my 97 Ford Escort for almost 5 years and had always used unleaded to gas it up but after moving in with my boyfriend I find out that he likes to use the super (the 2nd grade) on his car it does cost more but he says it's better to his engine which is a 2001 Windstar, I am thinking of switching over to the 2nd grade but I was just wondering if it was better than unleaded or not?