Not all tuners will increase MPG. We cannot guarantee EFI will but can tell you on average what we see. Results vary as driving habits, grades, loads everything plays a role in it.
I don't know when the last time you changed a fuel filter but start there it may help. Try a different HP setting as well. The one you're using may not work with your style of driving. If not give EFI a try. We will be more than happy to help you get it.
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