Robert, a new client of yours, is a self-employed caterer in Nashville, Tennessee. Robert drives his personal van when delivering catered meals to customers. You have asked him to provide the amount of business miles driven using his vehicle. You are planning on using the standard mileage method to calculate Robert's deduction for transportation costs. Robert has responded by saying, "Well, I don't really keep track of my miles. I guess I drove around 3,000 miles last year for the business." What would you say to Robert