Same exact setup here, 00 CC 4.7 Auto 4x4, 3.55's (non lsd), and tonneau.
When on the highway with the speeds varying between 65&75, my MPG vary's
between 19-25. Of course if I hit a hill on the highway, the mpg goes down
to 15, but right back up after. I haven't had a complete highway trip (from
top of tank to bottom) with a unloaded truck, but I would assume around a
18-19 mpg average. Oh and I have 5500 miles on it...
Josh
http://dakota.jumpautos.com
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