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 - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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