I'm looking at this thread because the same thing is happening to me. I add my actual car business expenses and it shows a $5,102 deduction which lower my refund from $1,221 when I had the straight mileage expense of a $1,800 deduction, to now a refund of $766. So it would make sense initially to just go with a straight mileage deduction, I'll save $455 that way. That's crazy.
