The cost to drive around the entire United States and to go through every state in the United States of America will cost around $3,000.00 to $5,000.00.
The cost of gasoline would be around $1,250.00 to $2,500.00 depending on the miles per gallon that your vehicle gets.
A car will use less gasoline than a truck or Motorhome would so you would have to factor in your gasoline cost and then if you're traveling by car or truck without an RV then you would also factor in the cost of a motel or hotel room per night.
So expect to spend around $3,000.00 to $5,000.00 to complete a car or RV trip around the United States.
I hope to one day before I die go around the entire United States and visit and see every state in the United States after I sell my house and move into an RV hopefully one day.