Thanks for the responses,
One reply that is important stated this "There is better overall aircraft performance than you may suspect due to the real OAT is colder than the assumed temperature input for the engines. The engines would produce the same thrust if operated at the assumed temperature, but the wing is flying in the denser air at the actual OAT".
I have read this before and I believe the more the ATM, the more the benefit from this fact.
I have to admit, it is the high speed RTO scenario that makes me post the original question. So from an RTO point of view, is the somewhat longer runway helping me with the derated thrust and different flap setting? What about when the runways are wet where reverse is in the calculations for an RTO?