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Quick question for you. Is there an additional hose off of the overflow bucket that just runs down to the ground? Something very similar happend with my S10. It in fact was the head gasket, though I was able to smell the antifreeze. What happened was there was a slight crack in the head gasket. When combustion took place in the cylinder, it would "leak" out pressure from the cylinder into the cooling system, thus pressurizing the cooling system. Though it wouldn't allow coolant into the system. If you drove it long enough the pressure would build up enough to where it would push the coolant into the overflow bucket and then it would run out the hose on the overflow bucket that goes to the ground. But if the vehicle was just sitting still, like in your driveway, you would never see where it was leaking. A good test to try is warm it up good and take a look in the overflow bucket and see how much fluid is in there. If it is leaking as much as you're talking about it should be pushing a considerable amount back into the overflow.
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