Highway 31mpg; City down to 23mpg. Rarely get it under 23 (but the racetrack awaits.....).
Best ever: 39mpg
No mods to engine / exhaust.......
(Old 4cyl Mondeo- best was only 42mpg........but i was doing around 90mph for about 5hours straight....)
Dont know kerb wt of contour, but V6 mondeo with me + stuff on board approx 1500kg.