Quote:
Originally Posted by R2Home
I did not want to mess with DEF, even though it may not be a real issue. That was just me!
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Our 2007 Diplomat was one of the last coaches with a Cummins ISL that did not require DEF. I too had some reservations about it when upgrading to the newer coach. But in the end, the DEF requirement did not turn out to be much of a big deal - a bit inconvenient maybe, but not much more.
You don't need the stuff all that often, it doesn't cost a lot, and it's readily available at all truck stop fueling stations. I carry a 2.5 gal. jug from Walmart for those times when I may be off the beaten path for an extended period of time. That 2.5 gallons of DEF should take me about 800 miles, at a fuel burn of 6.5 mpg. The DEF tank on my coach holds 13 gallons, which equates to over 4000 miles.