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Dec 10, 2014My 2011 F-350 6.l diesel, SRW, gets 22 MPG on highway trips where we run at 55 MPH (90 km/h).  Tapers off to about 17 at 70 MPH.
Towing our 38'/13,000 lb. 5th wheel at 55 MPH gives us a shade over 12 MPG.
Towing our 38'/13,000 lb. 5th wheel at 55 MPH gives us a shade over 12 MPG.
- RusswolfordSep 08, 2024ExplorerThat’s about what I get with the same setup. - way2rollSep 08, 2024TrailblazerNot sure if you were aware but this topic is 11 years old. 
 
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