Hey, so I just brought a 2004 jeep 4.7l v8. I know with the gas prices i should have gone with the inline 6 but this jeep only had 15,000 miles on it, so like new for only 8,000 so I couldn't pass it up. What can i do to improve if any mpg. Anything i can buy, maybe a new muffler or anything. What you think. Thanks so much.