Join Date: Dec 2011
Location: Conroe, Texas
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I had an 05 3500 quad cab long bed 4x4 with 6 speed and the FASS, tuner, and cold air intake. That didn't really do much for fuel economy. She averaged around 15 all around. I now have an 07 2500 megacab 4x4 and she is heavy, close to 8000 pounds. Fab4's front and rear bumpers, 12k winch, flipbak bed cover, and gear behind the seat and in the storage area of that megacab. I've done a few mods, the Edge CTS, cold air, recent boost elbow and gen2 manifold swap, always been deleted with 5" inch pipe and an MBRB muffler. Overall she's mid 16's. On the hwy I can get close to 18. The difference is how fast I drive and how I let her shift. Stupid 48re loves to hang between gears on a gentle throttle. And with the 285/65r20 Michelin's OD doesn't kick in until 52-53mph. But running 67-68 on the hwy she only runs about 1680 rpm. It's when I run 70+ and start pushing 1860+ that the forces of wind resistance against that flat front end really takes its toll. I will say, when I first got her in Jun 2015, mpg was worse. The single modification to make the biggest mpg improvement was rebuilding the front end and getting her running straight as an arrow. New ball joints, hubs, Carli track bar, tie rod ends and drag link, shocks, and borgeson gear box and my tires have zero feathering. I align the tires myself with a simple tape measure, zero toe. Before all that, the additional drag of fighting loose steering and constantly fluctuating alignment had my mpgs in the low 14's.
2007 2500 MegaCab 4x4 5.9 w/ 2nd gen swap, CTS2, train horn, auto leveling rear air bags, Fab4 front and rear, 12k winch, Carli track bar, total steering/ suspension rebuild,
so @172k miles she drives better than new.