Hopefully they pay for car mileage in addition to the $18-$25/hr... (should be 57.5 cents per mile for business miles, apparently)... because that alone could easily amount to $18/hr.
* ~$0.30 is for gas, but if you're driving a fuel efficient Prius then your actual per mile cost is lower ($3.00/gal / 50mpg = $0.06/mi; though offset by battery replacement cost, don't know how much that costs or how often) * If your car is over 5 years old, you wouldn't be able to claim depreciation on it. But the standard mileage rate includes depreciation, so you're getting to deduct additional cost if your car is >5 years and you use the standard mileage rate.
That's not to say wear and tear isn't a significant cost...just that your actual cost is usually much lower than the standard mileage rate.
Disclaimer: I don't like Jeff Bezos and would not work for Amazon barring extraordinary circumstances.