Looking for tips to inprove milage. I have a 27' Jayco Jay Flight and I tow with a Dodge 2006 Quad cab 1500 with the 5.7 Hemi and the automatic tranny with tow settings. This also has the low ratio axel and 20" wheels. If I stay 55 to 60 I am getting around 8 - 10 MPG. If I keep pace with traffic it drops to 6, or less. I just returned from Iowa and averaged 8.5 on the trip up from Oklahoma and returning pulled around 10 on my last tank on a 2 lane road at night. When I left Iowa coming home I had wind and I80 was packed so I felt safer keeping up with the flow of other big rigs. I only pulled 5.1 on the first tank. I have already modified the exhaust. I took the first muffler off and the second I replaced with a flowmaster, I left the 3rd muffler on. I think the next step will be to add a straight intake for better air and then I am thinking of a power chip. Does anyone have experince with these items, or other suggestions? I am particularly concerned the power chip may hurt milage. To run 65 mph, the engine is turning 2800 to 3000 RPM. I am now runing 87 octane with 2 bottle of gas treatment in each tank when towing. The engine runs as well or better with that than on 93 premium. thanks for the comments. I am new to the forum and to full size trailers this year and spent hours reading the old threads before I bought. This is a great tool.