Accounting / Finance guy here.
You can't judge this with a rule of thumb like you can when buying a house.
You might spend 80% of your income on your car if you live at home with your parents and have no other expenses.
But if you're already spending 50% of your income on rent then even spending 15% on your car might be too much.
In other words its different depending upon your situation and you have to spend what you're comfortable spending.
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2012 135 Convertible 6MT
2017 Acura MDX
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