I’m starting a new thread because the old one was entitled “Should Mechanic Refund My Money?” which is an issue that is long since dead. I was at fault. However, an interested reader might refer back to it for supplemental information.
My car is a 2003 Mazda 6. It is a 2.3L 4-cylinder/5-speed manual, with 61,000 miles on it.
My mileage decreased from to 25 MPG to 18.5 MPG. I started noticing this immediately after having my timing chain replaced. I had run my engine low on oil until the chain was audible, then drove it several more days (not realizing it was the timing chain causing the rattle), until finally the car lost power. I shut it down very soon after it lost power (as soon as I could get it to a safe place to park it) and had it towed to the garage.
Why would mileage decrease so suddenly? I have monitored mileage closely throughout the lifetime of the car, and it was almost exactly 25 MPG for years. Then suddenly 18.5. Looking for answers, I found the air pressure was down in the 20s. After inflating the tires to proper PSI, the mileage is now 20.5. But 25 MPG down to 20.5 MPG? I don’t get it.
(Please refer to our earlier discussion, “Should Mechanic Refund My Money?” for more information.)