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Highway driving racks up miles pretty quick. The good part is it's usually low-medium load conditions with a warmed up engine (low wear).
Not really sure what kills cars so quickly in the Philippines, so I don't have a reliable answer for A. All I can say is that I'm at 30k and have had no issues so far. For comparison, I normally expect a modern car to reach 200k miles before it's junked.
For B, I think the general estimate is you lose about 1hp per 20k miles or so due to wear inside the engine.
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