could those high 5.7's possibly have come from a performance ford magazine? i saw an article in there where they test drove the pursuit and xr8 ute and at best got 5.7 each and got an average 5.9 each, easily the best results ive seen for the boss 260 and 290 providing they didnt have to resort to such measures as bleeding the tank to 2L, removing the spare wheel and jack, heating up the tires to 50 degrees etc