And we also know the size of the loan he had to get from the bank to pay for the car and 100% of the FairTax. Probably about $65,000. At least $59,000 and change.
Your effective rate calculations are blather without having an accurate FairTax rate determination, and the 23% in the bill isn't accurate. Not even close.
If your price numbers WERE correct and the taxpayer had to borrow $59,000 (???), he'd be paying a lower interest rate due to the FairTax and it would help lower his effective FairTax rate as well.