Hamdog,
Are you using the overhead or hand calculating for the fuel economy? I wouldn't trust the 'Guess-O-Meter'.
MikeyB
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'03 2500 QC SWB 2wd, 305/555, NV5600, 3.73 LS, Airbox mod w/Amsoil Ea, Fogzilla mod, Adjustable boost elbow, PML diff cover, Westach boost/EGT gauge, Line-X, Sirius, Toyo OC AT 285/70/17 E, Daystar 1.5" lift, Monroe Reflex, Raptor RP100, SMARTY, Lazarsmith Intake