Originally Posted by groundskeeperllc
I have a 05' 3500 single wheel 5.9 and i pull a 20' gooseneck with lots of stuff on it and i get around 16-18 around town and I without trailer on highway doing 75mph i can get between 32-35mpg depending on wind direction. I havent had mine tuned yet, but I have a K&N air filter and I run Mystery Marvil Oil in my fuel.
25mpg is also high doubtful with just a drop in filter and using mystery oil! I know for a fact to because I read Diesel Power too and the best of mpg was a Duramax LBZ and those 10 contestant trucks were built for MPG on that specific test! Some would even tape cardboard around there rims and tape up their grill for better aerodynamics.Ps the Dura got 24mpg
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