From what I’ve researched that is a low pre-incentive discount. I forgot to mention this was a loaner at one point. I’ve seen up to 12%. There may have been higher ones but I haven’t seen any. I am unfamiliar with brokers outside what I’ve seen on this forum. I haven’t researched any broker listings.
Mileage penalty lowers the residual value, which increase how much in depreciation you have to pay. Part of why you’d need a much bigger discount to consider it.
There is still some room. You could try and hit 10-11% by shopping or using a broker. Texas in general is not very competitive and shipping from out of state may kill the deal.
I misread it, the calc link is your proposal, I thought you have an offer from the dealer. Like others said, shoot for a higher discount and enter the mileage in the calculator.