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With 43,000 on our truck, I have gotten 20.4 one time. It was a trip from Raleigh to Knoxville and back on I-40. Deliberately drove to get good fuel mileage. Example mostly at 1900 rpm which equals about 64 mph. Hard trip ... everything on the road ran off and left us!
When I run her at interstate speed she drops to 17-18 .... around town (which isn't big city driving by any means) she'll usually hit 16+ ... Jim
 
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