You may or may not know Paul. It will depend on your generation. He is the financial analyst from Money magazine who suggested paying an extra $10 per week off your mortgage can pay it off 7 to 8 years earlier.
These days that equates to $30 to $40 per week. Regardless, it works. Money is cheaper than it was back then however prices have risen.
I remember my folks paying 23% interest on a mortgage! Times have changed. Which leads me to Know your finance options...Markets within markets.