This past weekend my wife and I went to Lake Wallenpaupack in the Pocono mountains(day trip) about 2.5hrs ride. Check Fuel Economy when we got home, and averaged 13.9 MPG, this was hand calculated not from the DIC.

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2004 Hummer H2 " Metallic Red "
20 inch Mojave's (Teflon)(325/60/20) BFG A/T's
MagnaFlow kitty back...Hypertech Tuned..Music to my ears
HCMI Member 50043