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Old 10-24-2015, 11:58 AM   #1
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DEF useage

I have seen several posts on several forums asking about DEF usage and various answers. We just returned from a 9 week trip across 17 states with various terrain from plains to Rocky Mountains. A great trouble free trip with the following stats that might help new owners plan for upcoming trips.

6679 total miles

607 gallons of diesel = 11 MPG
16 gallons DEF = 37.9 diesel per gallon DEF

As per many other posts on the Berk forum, I gave up trying to use bulk DEF pumps at the truck islands, all on the left side. Easier to refill my DEF container, then pour into my DEF tank while at a campground. However, Walmart just introduced their own brand of DEF priced at $7.88 per 2.5 gallons, about the same as bulk price and in a nice container. I try to add DEF as soon as I consume 3 gallons or so just to make sure the system does not have to work to keep up.
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Old 10-24-2015, 12:29 PM   #2
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Math; 16 gals DEF / 6,679 miles driven = 417.4 mpg of DEF.
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Old 10-24-2015, 11:20 PM   #3
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I've been using the Walmart brand of DEF, too. Whenever the first light on the gauge goes off, I grab a jug on our next Walmart trip and add it in to stay mostly topped off. No problem!



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Old 10-25-2015, 09:39 AM   #4
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We are lucky that our local gas stop has DEF on both sides.....mpg is about the same as everyone else's....love our coach
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