Have owned a 2000 7.3, then 2006 6.0 and now a 2011 6.7L. The new truck is hands down the best truck I have ever owned. DEF is no big problem, 13,000 miles since November and have added maybe 3 gallons if that. You can buy DEF everywhere and even Peak sells it in 1 gallon bottles for $6.00. I...