Yes I took the stock muff off and put in a magna flow straight through muff. With the Volant I'm now getting 16mpg all around driving. Did 18 today going back a forth to work. Freeway 70-75 cruise EB on. Now when it comes to towing I do 10-11 MPG pulling 12,000 5er. I love the tow haul mode with the EB. I try to stay out of town cause that just kills the fuel MPG. 14.5-15.5MPG

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Winger
2008 2500 Silver 4x4 6 Speed Auto Big Horn Edition Volant CAI Magnaflow Muff Edge w/ Attitude
1990 Honda GL 1500 Wineberry 125,000 Miles
2005 Honda GL 1800 Candy Blackcherry 50,000 Miles