Let me bump this for you to see if someone else can answer. I wish I could help but I stopped paying attention to fuel economy a long time ago. I like to race too much.
All right, I'm back in Corpus Christi, but the test got screwed up. I ran back from San Antonio with the truck in "stock" mode, but there was bad weather and a bad headwind. I only got 17 mpg (which is still pretty good, but I wanted to have similar conditions for the test).
Like Stump said, the economy tune (mine is economy/street) adds enough power that it's hard not to put the hammer down I can't imagine the street or looney tunes. I'd hurt the truck if I either of those
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