Mike, my cousin is getting 19-20 mpg on the freeway...slightly less mixed driving. And he gets in the teens towing. His towing mpg is what I get non-towing! I really need a diesel with all the driving I do! FWIW, he's only on setting #2 out of 4. He raced his dad (I was in the truck) he has a '03 6.0L Silverado 4x4 before the tune and they were pretty even....after the tune the diesel ran from him! I haven't always been a fan of diesels....but now that I've been around them more and I tow quite a bit these days I really see the need for them!
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Tony
'68 Camaro
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