Here we go again with the milage thing...I was getting 9-10mpg ( 99% city driving) with my 98 ram 4x4 qc 5.2, 70k with a flowmaster one in two out k&n "drop-in" with stock air cleaner housing. I have not done a tune up and last fall I maxed out my tire air pressure. thats it, and now with "Summer Gas" supposedly in the pumps I 'm getting 13-15 mpg!!!!!!!!!! I'm not complaining but is there really that big of a difference???? And if so f*** the "winter gas" give me the "summer gas" ALL YEAR LONG!!!!!!