08 GT with CAI and a tune.
I run 93 octane because of the tune, and I can get 26-27 on a long trip. Normally high teens/low 20s in daily mix of highway/surface streets.
Here is the interesting thing, I bought the tuner solely to turn OFF the annoying DOD (the thing that makes it a 4cyl to "save gas") and my MPG didn't move an inch. If anything the 93 tune probably moved it up a little.
So for MPG, you can get away with a tuner and slapping that bad boy in 8cyl all the time and not lose a thing (good excuse anyway).
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-Jon
2008 Pontiac G8 GT (One of those LM guys)
1967 Chevrolet Camaro (ugh and a Chevy guy)
1973 Jeep CJ-5
2000 Jeep Cherokee Sport (DD)
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