KBB.com 10 Best Used Cars Under $15.000. Only 69.107 Miles! Delivers 31 Highway MPG and 21 City MPG! This Toyota Avalon boasts a Regular Unleaded V-6 3.5 L/211 engine powering this Automatic transmission. Window Grid Antenna. Valet Function. Trunk Rear Cargo Access.* This... via V12 Software