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Old 05-06-2011, 06:28 PM   #5 (permalink)
Master EcoModder
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Join Date: May 2009
Location: Charlotte NC / York SC
Posts: 726

05 DMax - '05 Chevrolet 2500HD
90 day: 18.48 mpg (US)
Thanks: 107
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Welcome !

The diesel manual would help a lot. My last 2 tanks without the trailer have been 19 MPG.

The fairing in the above and the kammback are good ideas. Switching to a longer but very square back trailer (toy hauler) actually increased my FE from a smaller rounded trailer. I put that to better flow seperation in the rear.

I had a deflector on a prior rig that helps, but don't stand it up too much. I think one that goes closer to the trailer as above would really help.

I can't understand why my MPG's are so low..........
21,000lb, 41' Toy Haulers are rough on FE!
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