I also have a 2011 Storm with the Ford 6.8L V-10, purchased new in the fall of 2011. Just got back from a 3 week trip through the upper peninsula of Michigan - about an 1,800 mile trip for us. The coach now has about 2,500 miles total. I'd be happy with 6 MPG as we averaged about 5.7 MPG. We did have a tow dolly and all the driving was done in the "Tow Haul" position. I tried to keep RPM's to between 1,800 and 2,000 and would say that 85% of the miles were in this range. No question that this engine has all the power I need, but I'm disappointed in the fuel mileage.