Depending upon how you drive - you'll get 8 to 9 mpg.
Subtract up to 0.3 mpg if running your diesel generator so your house A/Cs can run when driving.
Subtract 0.1 mpg for every mph you go over your sweet spot (most likely about 62 mph).
And subtract accordingly for driving like its a hotrod or if you waste money on getting it chipped thinking the extra HP is free.
2008 Phaeton 36QSH, Safe-t-Plus, Quadra Bigfoot
2017 Jeep Cherokee Trailhawk w/ flat tow wiring mod.
Blue ox, BrakeMaster + BrakeAway, diode lights and charge.