The average 20-year fixed mortgage rate is 6.55%, slightly up from 6.52% a week earlier, with a 52-week range of 5.79% to 6.65%. A 20-year mortgage offers faster equity building and potential interest savings compared to 30-year loans but requires higher monthly payments. Tips for securing the best rate include improving credit, lowering debt, saving for a 20% down payment, shopping lenders, locking rates, buying points, and considering a co-borrower.