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I also have an 8.1 and have duplicate towing mileage of about 7.5. I added a K&N air filter along with a Magna flow thru exhaust and my non towing mileage went up 2.8 mpg. Have not checked it while towing, but am hoping for some additional gain. And, like you, I have added the superchip but have not tested it while towing. I'm guessing, like you, I have been suckered into buying something that won't work.
Just a comment on buying a diesel. The mileage gain will not be that great towing a rig our size. Plus, if you are retired, like me, you can buy a lot of gas for the $60k new truck investment. It might take a lifetime to recoup the investment in saved fuel. My 8.1 tows as well as any diesel around. I try to be happy with what I have.
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