very common for them to leak at the head gasket, usually externally, remove the engine undertray & check for green stains, caz's car had this problem with only 60,000 on the clock, it didn't seem to be losing alot so i ignored fixing it & kept topping the coolant up once a month, engine blew up at 105,000 not sure if related hahaha

auto trans is woeful, car likes to drink even without a hefty foot, i was getting better fuel economy when i had the unichip & vf22 on my ej205 5 speed foz

edit: my advise (obviously) is to buy an sf5 foz instead