If you’re saving for retirement through a 401(k), two simple plan features could mean the difference between an average balance and one that’s $50,000 higher. Find Out: Dave Ramsey: The Biggest 401(k) Mistake People Make Read Next: How Far $750K Plus Social Security Goes in Retirement in Every US Region The average 401(k) balance is now $107,430, according to new Bank of America data. But 401(k) participants in plans that use auto-enroll and auto-increase features have an average account balance of $158,0 ...