The 6 speed box is nice, strong, slick etc...and seems setup perfectly as far as I can tell. Every gear change wangs the revs to 5,000RPM which is peak torque and then it just screams like a biatch to 6,800RPM.
Mine is a saloon too, it has slightly better areodyanics than the rest of the range and looks better imo.
MPG...depends how you drive it? Worst I've got was 20mpg and that was giving it constant death over 182 miles. At 120mph its doing about 19mpg, at 70mph its doing about 35mpg and at 55mph its doing 40mpg. However I have averaged 43mpg over 60 miles of motorway and often see an average of 30mpg over a tank, 32mpg being my best.