Re: Hand Calculated Mileage figures, post them here!
Add the urea to the milage equation see if it hurts it any.
Having to do the Urea Tank fill is part of owning a newer truck. If we all didn't except it we wouldn't have bought a 2011 truck. As well as I'm sure if we lined your truck up next to mine and explained the maintenance everything went on with taking care of each truck I'm sure out of 10 people most of them would chose the 2011 truck over the 2004.
2012 Ford F350 Tuxedo Black King Ranch, SRW, LB, 20" Wheels, Upfitter Switches, etc......
2011 Ford F350, SRW, LB, White Platinum Tri-Coat, Lariat Ultimate Package, Black Interior Leather, 20" Wheels, Upfitter Switches, etc........
2006 Triton TR20X Bass Masters Classic Edition