In that particular case yes. No one will convert that amount of BTC for a car. Sell for fiat and convert to BTC.
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Discussion
You might not, but I would. I have before. I will again. Some of us try to cut BTC out of our lives. Convert every dollar we have into Bitcoin. But that means, when it comes time to buy a car, Bitcoin is what we have for purchasing. And thats a good thing. Put the dollar out of business and use Bitcoin.