Well first off hats off to you for achieving nearly 20mpg in a 4.8 That is quite impressive to a lead-footed a-hole like myself.

Why 2008? Given power is not important maybe a 2009 diesel is your best option? Good gas mileage and nice torque.

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2011 50i BS/Black Nevada
(gone) 2007 4.8i AW/Tobacco