i talked to a guy the other day that has the 6.7 and tows cars around the country with it. i think he said it had 80,000 miles on it and he swears it gets 20mpg. he said at first it got 12-13 then when it got to about 45-50,0000 miles it started getting alot better very quickly. i dont know if he was pulling my leg or not

but would love to see it first hand
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mine 2007 laramie 4x4 black with 5.9 and strait 6 inch exhaust by bullydog. quad cab 8' bed 3500 srw, nav, sunroof and bucket seats, bullydog rfi ,silencer ring MIA, bullydog pmt ,hornblaster train horns

my work trucks:
GONE BUT NOT FORGOTTEN 98 24V C&C...01 C&C....07 6.7 C&C