If it is a new Ford I believe it has the 6.8 litre which is a tad over 400 cu in. Unless the new 6 speed tranny is working miracles I would not count on getting much over 10 after break in. I think its on the E450 chassis which is really heavy duty for that size RV. Of course driving in traffic or over 65 will really cut into that number too. Congratulations on your new toy though.
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