Real world MPGs of Diesel trucks of the mid 2000 years

Changed the gear for the speedo and checked the MPH with a GPS to make sure it was right. I also check the odometer vs a GPS and mile markers on the highway. I like the speedo and odo to be right on my stuff, I'm kinda picky about it.
 
2003 dodge cummins 4x4 5in exhust, power puck afe cold air 6 speed 2in lift 35s mts. Lowest every towing big block fullsize bronco16.5mpg, best ever 21mpg on 37s empty
 
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