Coolant loss.....
Hi Again 1st Rover,
You should confirm actual steam from the exhaust, this should be easily seen after the engine is warmed up (looks like wisps of white smoke) The wet tail pipe you are seeing could just be condensation.
I have known people to run for over 100k with a pin hole in the head gasket, but it normally will slowly get bigger & it will corode away your O2 sensors, catalyst convertors & even your exhaust will rust from inside out (eventually).
Some people say the "head gasket repair additives" that you pour into the radiator work well with repairing small pin holes, but can also clog up your coolant system with this stuff.
Half a gallon of coolant loss over 500 miles seems pretty bad to me! It would probaly be best to have a garage inspect & confirm before taking any action.
good luck,
Andy
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