Don't buy a new car to get better gas mileage

I’ll stop you right there. You should probably figure out why you’re driving 60k a year if you’re honestly trying to save money. If you’re not a paid driver or being reimbursed by your job because they make you drive that much chances are you can do something to reduce the number of miles you drive a year. Move closer to your job, get a job closer to your home etc.

60k is 1153 miles a week, every week, all year. That’s 164.x miles a day 365 days a year. Do you live in your car?

Regardless, situations like yours do not apply to 99.9% of the population