There has been regular review of this, and understanding people want the easy button - there is no substitute for understanding the math and all the elements so you can compare any deals apples to apples. Saving thousands of dollars is worth the indignity of cranking out a spreadsheet
The LH MP Guidelines are intended to ensure all the advertised deals - include all the variables needed to plug-into the calculator and make your adjustments: different DAS, taxes, etc. It’s not realistic to expect every permutation of every make and model for every US tax authority -fed. Dealer advertised ads rarely if-ever include all those elements…
Do math, save dollars.
Standing in the trap and that sound you just heard is the spring grabbing you by the wallet.