Where can a person get free Internet when driving a car across the USA?
Free Internet is only free if you are not required to buy something you do not want or need. Therefore, if you do not want to purchase food at McDonalds or coffee at Starbucks, then you do not buy.
I will not be using Starbucks for Internet, the cost of coffee is a horrible value for the money. But I am listing United States companies that are in most states of the USA.
Easy and Cheap to Expensive --- Free Internet
Note: Best to check the signal in the parking lot, to make sure it is working...