I think you were taking my comments the wrong ways guys, When i said that racing cars are always at full throttle i was commenting on the fact we were talking about jumps, you ain't going to get jumps (hill crests) on a corner are you? - i know that you are possibly going to be on partial throttle when aiming for the corners apex but this is irrelevent when the subject is 'leaving the ground'
As for saying that keeping your wheels on the ground will always be quicker, i wasn't refering particulary to The Ring, where the crest is in the middle of a long straight, but more like a generalisation in the fact that anytime when your driven wheels are not in contact with the road surface - you are technicaly going to be losing speed. In rallying drivers will often lift-off before a crest to keep air time to a minimum.