Dear Liz: My FICO score is just under 800. The reason given that it is not higher is that I don’t have any non-mortgage leases. What would be the cheapest way to remedy this without buying something expensive?

Answer: When you get your credit scores, you may be given sometimes-vague reasons for why they’re not higher or lower. The “reason code” you saw probably said something like “no recent non-mortgage balance information.” What that means is that you haven’t been using revolving accounts such as credit cards. To get higher scores, you’d need to dust off your plastic and use it once in a while. (You don’t need to carry a balance to get or keep good scores, however. You can and should pay credit card balances in full each month.)

Any improvement in your scores is likely to be modest, however. Your numbers are already high and the factor known as “mix of credit” — which means responsibly using both revolving and installment accounts — accounts for just 10% of your FICO scores. Plus, there’s no real point in having scores over 800, other than to brag about them. Once your scores exceed 760 or so, you’re already eligible for the best rates and terms.