Finally tested so we can now see what the 4.0 TT can do. Slightly quicker to 60 than the W12 and quarter mile time is the same as the W12. The W12 has a slightly higher trap speed so it is likely a bit quicker past 110 mph. Fuel economy is said to be 15/24 on the EPA test compared to 12/19 for the W12. Based on the horsepower to weight ratios the S6/S7 should actually be about as quick with the S8 almost matching the E63/M5 acceleration wise?
0-60: 4.2 seconds
1/4 mile: 12.7 @ 110.8
http://www.motortrend.com/roadtests/...v8_first_test/