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 - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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