Mileage and DEF

  • 08/02/2013 8:48 PM
    Message # 1357304
    Deleted user
    do the newer RVs that use DEF get better mileage?  a salesman (who else) told us it was a 30 percent improvement.  My husband checked on line and read 3-5 percent.  anyone have personal experience?

    Lynn
  • 08/03/2013 9:30 AM
    Reply # 1357556 on 1357304
    Deleted user
    I had a 41' 2007 Mandalay with a 450hp Cummins diesel that got slightly more than 9 mpg. I now have a smaller 34' 2013 Excursion with a 300hp Cummins diesel that has been averaging 10.5mpg since I bought it, which was a pleasant surprise. I hadn't expected to do that good. However, how much is due to the difference in wt and hp vs a more efficient engine, I cannot say.

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