Don't think you will get 8000 miles on a tank of DEF. The later MBS like ours only has a 3.17 gal tank. Good for approx 3000 to 4000 mile. Still a pretty good distance but I don't like seeing the light come on. Gives you enough distance to not need to carry extra. I service mine prior to each trip and approx 2000 miles while on the road. Just me.
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2014 Solera 24R
USN Retired
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