Uhh, where do you live? I live in Wichita Falls, TX, but come up to OKC regularly. I have a Superchips 3815 (still!!). I don't recall seeing a fuel economy difference on the 87 tune, but I do get another 1.5 mpg from the 91 tune...it dials in more ignition advance. Only tried the MPG tune on one tank, then went back to the 91 perf tune. I like it! Both the 87 and 91 tunes gave better drivability. Superchips also tweaks the tranny programming a bit; the newer 3865 even lets you do custom tranny programming.
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4.7L Flex-fuel Inferno Red Quadcab, w/dogamatic trans. Couple of mods...
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Hybrid Mode
