A guy who owns an Aussie Mondeo ST24 supposedly hit 237km/h (around 148 miles/h) with a stock Duratec (125kW). All Aussie ST24's are manual transmission and obviously no speed limiters!
It was done in the Northern Territory, where there are lots of long flat roads and no speed limits..... Must go there one day!
By the way all ST24's come factory fitted with 205/50R16 Z rated tyres.