I used a bottle of in it my race cars. I mainly use it since I have to run straight water and it helps keeps the waterpump lube. I think it might've made a 5-10 degree change at the most at the track, but I have no street experience with it.
I use Waterwetter in my 451 ci 11.1 c.r. with 22 inches rad with shrould , never had overheating problems... The trick is more use of watter = less heat in the engine. antifreeze is not the best to cool engine. during summer you don't need antifreze...
