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Speaking of, my thinking is that paying extra on a 30-yr loan pays down the principal faster than paying more monthly for a 15-yr loan. True? I'm sure there's some calculator out there, but I couldn't find it. Thoughts?

All other things being equal, it doesn't matter. If the 30-year and 15-year mortgages are at the same rate, making extra principal payments on the 30-year mortgage every month for exactly the difference in payment between the two will pay off the mortgage in 15 years.

However, all other things are seldom equal. You may get a slightly lower rate on the 15-year mortgage. 0.25% of an amount big enough for a mortgage is enough to take into consideration. OTOH, you may not be confidant you can consistently swing the larger payment for the 15-year. In this case, the conservative course is to take the 30-year mortgage and pay extra principal to the extent you can.

If you refi at 1% lower interest, but continue paying the same amount of P&I that you were paying on the current mortgage, the mortgage is retired faster. How much faster depends on the details.

Two things are important here. First, that you understand the implications of the refi, the interest rate, and the extra principal. (Looks like you're in pretty good shape there.) Second, that you actually make any extra principal payments that you are planning to make.

who paid extra principal on his mortgage for 102 consecutive months, and crunched the numbers for many different scenarios
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