Very interested in learning how to make my used '07, CX-7 running well for a few years. I bought it in Aug, '15 with 110k mi. It is a Touring, very clean and runs good, but lousy gas mileage (14.3 suburban) and persistent CEL. (P0300, P0303). Previous Mazdas were '80 GLC, '90 626 and '04 Mazda 3 Hatchback. Sadly, they all succumbed to rust. Hoping to avoid with CX-7.