When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The only way to improve mileage is to buy a Ford Escort and drive it!
Sorry, but I couldn't resist.
Do you have manual hubs? Going to manual should save some as yer not turning as many drive train conponents. You could also change out the gears in the diff's to a numriacal higher gear set. This is expensive though.
You have to remember that these ole 4x4 trucks were not made to get high mpg.
Make sure it is tuned up and operating properly as well as the above. Alterations such as bigger tires or diff gearing will NOT pay for themselves in fuel savings.