The roads were dry so I thought I'd use the M6 to take a weekend drive. Checked the mileage on the 180 mile drive from Marshfield to Iron River Wisconsin. It was 13 degrees when I left Marshfield and 19 when I got to Iron River 181 miles later. 21.3 MPG on a 2-lane highway with 14 small towns in between. Same trip and about the same temperatures back & got 21.5. I'm sure it will do better in warmer temps. Anybody else getting these mileage results? My car is a 6-speed with secondary cats, H-pipe, & resonators removed with an X-pipe installed. Removed the carbon filters and added the RPI scoops, block-off plates & BMC filters.