what can I expect for continued life on a 2007 Scion tC with 178,700 miles?
Your question it too general. factors that should be considered are maintenance, driving styles, number of different owners or drivers, and environmental factors such as corrosion. All things equal that type of car should be experiencing elevated maintenance issues at 150-160k and reach end of useful life at 225-250k where cost to maintain will exceed value of operation.
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