Someone posted some data from an independent source here a few weeks ago on tire performance. The test showed very poor performance from the Conti's but it was for the GP 3000 rather than 4000. I noticed the 4000 doesn't had trad grooves all the way across like the 3000 does so maybe that's one reason why the test had such high rolling resistence compared to others. If that's the case, why would a company as experienced as Conti make such poor performing tires. I wonder if data exists for the GP 4000?