Have somebody test the radiator cap. A weak pressure relief spring, and/or a bad gasket will allow it to puke coolant after shutdown. A good-condition cap a couple of pounds higher rating might help IF you've got a tubular radiator that will handle the extra pressure. Don't overstress a honeycomb radiator with a too-high pressure cap.

A recovery system will allow it to recycle the coolant, if you don't mind going non-stock.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!