You need to let the old girl breath before you go programing. I would buy or make intake with a good filter and get 4 inch turboback exhaust then a tuner. Letting your truck breath better will be the first step in my opinion. Would you want to run a marathon trying to breath through a straw? You wouldn't be very efficient trying to breath through that restrictive straw Right? Its the same concept the factory intake and exhaust are very restrictive and that makes for poor MPGs. Good luck on your quest for better MPGs! Once you pop (the hood) you cant stop!