It does say
Every owner I've ever dealt with did mileage the way the lawyer did - I have X miles on the vehicle, it's Y miles from home to work, X-Y= miles driven for work. Never had an issue.
Great advice. I once had an attorney who did not keep logs. He guestimated. The IRS opened up a can of whoop on him. Luckily, there was a database of his calendar with all of his court cases. I was able to reconstruct his mileage to within about 20 miles of his guess. The IRS agent didn't believe that would be enough evidence until I showed him there was a federal record of the attorney in court on those days at those times. He randomly sampled about 10 of the records and found all to be spot on. [The attorney was an honest guy, he worked six days a week and only used his car for work, so he had taken the mileage back and forth to his house and subtracted those miles from his odometer at the beg of the year to determine how much he drove].
The moral of the story is to keep records!
Every owner I've ever dealt with did mileage the way the lawyer did - I have X miles on the vehicle, it's Y miles from home to work, X-Y= miles driven for work. Never had an issue.