Adding a turbo to a gas engine with no fuel increase raises the effective compression ratio and can increase MPGs. Not usually so with a diesel. Not unless you are trying to compensate for thin air at a high altitude. That is why they used to be called "altitude compensators."
What kind of MPGs are you getting now? I have owned and driven IDI Fords for years. My current driver is a 1994 with 4WD, 4.10 gears, overdrive trans, and 7.3 IDI turbo that runs a max of 7 PSI. If driven empty at 65 MPH it gets 17 MPG on the relatively flat highways in northern Michigan. When I lived in the mountains of New York, it averaged 15 MPG doing the same.
Ford used two different types of dealer-installed turbos. Banks and ATS. The Banks ran more boost. ATS became adopted for factory installs and that is what my 1994 has. The 7.3 engine with a factory turbo is not the same engine as a non-turbo 7.3. It got slightly beefed up in some areas by International Harvester at Ford's request.
General rule of thumb is this. If you have a lot of black soot in your tailpipe now, and often see black smoke - and adding 7-8 PSI of boost gets rid of it, then yes - you should get slightly better MPGs without touching the injection pump.
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Today's Featured Article - Haying Before Tractors - by Owen Clark. Hi guys! At age 8 (1927, am now 79) I was learning how to drive a stacker team on the old homemade A-frame wooden stacker, on three of my uncles` dairy farms in Star Valley Wyoming (south of Jackson Hole, on the Wyoming-Idaho border). There was one steam tractor in the Valley, owned by an entrepeneur who used it to run his grain threshing machine, that he hauled from farm to farm for the fall harvest. We used teams of horses not only on the stacker, but on the buckrake to buck the dried
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