I saw a shootout at Norwalk Raceway Park a couple years ago for the World's Fastest Streetcar. They had to complete (I think) a 20 mile parade route (could have been 10 miles) to prove they were street worthy, have it inspected to make sure it was street legal and then ran em down. The final two were in the 7.0 sec range and that was on a cold track (40F outside). Easily in the 6.9's or better if it was warmer and they could hook up the tires. HP is useless unless you can put it to the ground. Nothing like watching a 6 second car drive home from the track after a day of racing.