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Yes my truck started out at about 21mpg.
GM didn't start turbo charging them from the factory till the late 80s or early 90s. By that time they had changed the heads to produce more power and less economy, 3.08 diff gears were no longer put into most trucks.
Back then diesel was cheap and they were going for more power and moving away from economy.
Last time I ran My truck I was getting 26mpg, since then the new engine went in and is untested. I think everything I did internally should be good for 2MPG, I dont think that is unreasonable.
Thanks to banks engineering any year non-turbo 6.2 or 6.5 diesel can be turbocharged and as of last week they still offer product support in the form of fairly pricey replacement parts.
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