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[RC] Improving Diesel MPG-OT - Susan & Jerry Milam

Hey guys as I look at my planning for this new year in attending rides, I'm also looking at ways to cut my costs in driving my GMC 2004 Duramax Diesel.
 
Right now with no aftermarket gadgets, I normally get 14MPG when I haul. 17MPG is the best I get non hauling hiway mode. I don't drive crazy either.
 
My speed in both modes is 58-62 mph. Any experience at tweaking MPG with a diesel?
 
Appreciate any help on this. Thanks!
 
Susan