My daily drive to work is 60mi one way from the gas station. Sometimes in the morning I'll fill up my truck with the same pump at the same fill rate (first catch on the gas pump so it doesnt foam as much) and I top it off to the even dollar amount. I drove to and from work (120mi round trip) and topped off my truck again at the same pump with the same pumping rate...to get the same amount of fuel in there...ideally. I drive with the 140hp tune 95% of the time and my hand calculation was 16.9mpg which was the same as the OHD 
ChrisCNC, is your truck 4x4 or 2x4?
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01 F350 7.3 4x4 CC SRW/3.73/315-75-16/Aeroforce Interceptor/BD Thruster II/ Bellowed Up-Pipes/4" turbo back exhaust/CCV Mod/DIY 6637/FPR Shimmed to 65 PSI/TS chip reburned with PHP tunes (Stock, 40T WITH Whsiper tune, 80DD, 100R, 140Ex, 140SS)/Replaced and Cleaned EBPS & Tube 4-6-12/Zoodad mod/Recon smoked cab lights/MM Hubs/Cowl Hood/HPx
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