That's not good for your financial situation.
You are better off not maxing out your credit approval amount. If you already can stomach driving around in a Chevy Malibu, then you could get a 2013 Chevy Malibu for probably around $13,000 to $15,000. If you decrease the principal (the amount you loan) by $10,000, you're total interest difference over 36 months would be around $3,000.
But a better plan is loaning $8,000 at 18% for 24 months for what I think would be a $400/month payment. Then, you pay off that loan and that would improve your credit score. By cutting your car bill expense in half, that would allow you to save $400 a month so you would be able to save $9,600 after 24 months. In total after the 24 months, you would have better credit score, equity in a used car ($8,000 minus depreciation), and $9,600 in the bank.