Well if it is using that much that quickly its gotta be going somewhere. So if there are no leaks. Where is it going? It cant be going into the oil, you would see a leak somewhere. So it must be burning off and going out your tail pipe. It seems like you need a new head gasket. Check your oil and see if there is anti freeze in your oil. That would tell you

00 tacoma 4x4 ex-cab stock 193,000 and counting

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