Store bought antifreeze does not remove/transfer heat as well as water.

For less than $10 you can buy a bottle of rust inhibitor that will prevent corrosion as well as antifreeze.

For those racing in a climate that does not go from non freezing race day temps to 25-20 degree F overnight (examples please), the resistance to freezing is unnecessary. If you have any solution of rust inhibitor, straight water's freezing point depression gets lower than 32 deg. F. It lowers the temp for the water mixture to form ice crystals.

Coolant is really hard to get off a track. In an oil or water spill, our track crew brushes down lots of kitty litter, goes over it, and has the racers go over it before we can resume racing.