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Rich are you still putting in the cetane or any other diesel additives?
That may make the difference. The quality of the fuel. The grade of the fuel also goes into the outcome.
My chevy just turned 36000 and it is the same 13 - 15 in town, better on the open roads, but not great numbers. I've never broke into the 20's. I've never gotten the mileage of the pre 07 GMs. Those mpgs are a thing of history. New EPA restrictions on these trucks have made highe mpg obsolete.
Just my 2 cents
Chuck
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