My 4.8 with 3rd seat gets close to 14 mpg. Not very green. Not sure what the rest of your 4.8 folks are getting...

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4.8|Sport Pkg|Prem Pkg|Cold Weather|Nav|PDC|Comfort Seats|Nappa Leather|Convenience Pkg|Rear Climate|3rd Row|HUD|SAT Radio|HD Radio|Dual-Monitor Rear DVD Player.