Just a thought and way off. Maybe the Ford and Diesel guru's can help me out with some info. I got a 93 Ford E-350 retired Ryder Box Van. Its factory MFI 460 7.5 gas and Auto overdrive trans. The truck runs wonderful but drinks more gas than I do Pepsi and thats real bad. So, if I was to consider swapping to 7.3 PowerStroke, what would I gain as far as mpg and hp/torque? Currently has a butt load of torque but is a sled as far as speed. Not realy concerned with speed, but wouldn't want to give up any torque. Truck gets 8-9mpg against the wind, and 9-11mpg with the wind. Same mpg loaded or empty, city or hwy. If I decide this swap, Does the 7.3 bellhousing fit the same transmission??? Up to what year is the 7.3 all mechanical to where I would not need wiring harness or change ECM, or would it be best to change it? I am sure in 93, the 7.3 was an OEM option, so this should not be a real hard swap and be able to keep the same trans. Anyone know what all would be involved to make this swap? 7.5 Gas to 7.3 Diesel? Is 93 models turbo or non turbo? Could I go either way? What are the pros and cons? Lots of questions to consider and get answers to. Thanks for any suggestions or help.