Contrary to what some say, it is a fact the Estate is 25-45 KGs heavier than the saloon/ coupe & has more drag. ( Cd 0.28 vs 0.24) Mods are listed. I reckon if it was the more slippery coupe it would be 2/10ths quicker and trap 2-3mph higher. Conversely the extra weight over the rear axle helps it get a cleaner launch.