Ok guys, I need some suggestions here. My Dad has a '97 250 PSD Heavy duty 4x4 SC LWB. He has around 176K miles on it. He was going to trade for a Ranger to save fuel $$$. I talked him out of it. His truck is in great shape and has been maintained reguraly. I already told him to go back to factory tire size to increase fuel milage. He is currently getting 21-22 HWY and 14 Towing. Any other suggestions for this first Generation PSD to gain MPG's? I was thinking programmer but dont know which is best for his truck.