I think a really simple and sort of bash-you-over-the-head means to get this across to homebuyers would be to tack on the monthly utilities to the mortgage+tax

I think a really simple and sort of bash-you-over-the-head means to get this across to homebuyers would be to tack on the monthly utilities to the mortgage+tax number that people see. If you were comparing the price of two houses, you often look at the monthly cost of mortgage and taxes... so throwing utilities on there would make it more apparent which house will actually be cheaper over the long term.