Huh, I would argue that someone who has 70k after tax per year to spend generally shouldn't be buying a car with debt _at all_; they should be able to afford to save and buy one outright.
I save for my cars, I don't, generally, finance them. I did finance one car once when I was a young engineer and still had student loans. I did it because I was just starting my career. Paid off the loan completely within a year.
I basically think everyone, no matter your income, should strive to save for their cars as much as possible, and try to avoid financing. Always financing a car is a trap to always spend more than you can really afford on a car. Saving and paying cash allows you to really gauge what is affordable. Even my sister in law who makes close to minimum wage has always been able to save for her cars and pay cash.
