I've had four Suburbans with 6.2 diesels. The highest any of ever got on a long flat highway was 21 MPG.
My 1988 GMC 3/4 ton 4WD Suburban with a 6.2 HD J-code, a T400 and 3.73 axles got a best of 18.5 MPG.
My 1987 Chevy 3/4 ton 4WD Suburban with a HD J-code 6.2, T400 and 3.73 axles did exactly the same. 18.5 MPG.
My 1991 Chevy 1/2 ton 4WD Suburban with a LD C-code 6.2, 4L60 trans and 3.42 axles got a best of 21 MPG.
My 1992 Chevy 1/2 ton 4WD Suburban with a J-code 6.2, Banks turbo, 4L60 trans and 3.08 axles got a best of 19.5 MPG.
Note all my Suburbans were driven in NY at 1600-1900 feet elevations. When my son took my 3/4 ton Suburban to Colorado at over 6000', mileage and power dropped like a rock. Went from a best of 18.5 MPG down to 14 MPG. He later had to add a turbo to it just to pass the Colorado smoke inspection.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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