Mis allocation of $30,000 for a car loan out of $3,000,000 net worth is only 1%. The after tax return on a 5% MM or CD is about 3%. The net effect is barely a rounding error.

Paying off $300,000 out of $3,000,000 net worth is a much larger mis application of capital, especially if you can deduct the mortgage interest. My preferred technique is keeping an account filled with SPAXX or FZCXX and drafting the monthly payments. It captures the return arbitrage AND removes the hassle of a house payment.

Bonus: In a tight financial situation or market collapse buying opportunity there is liquidity vs equity. Other than a GRAT or homestead exemption in a lawsuit, there are few times equity beats liquidity in a primary residence.