Awful fuel consumption - up and down

alecleong_161742
Mon, 06 Jan 2020 05:48:44 +0000
Maintenance/Repairs

About 4k miles ago I replaced the previous spark plugs in my 2007 mazda 3 2.3l hatch with bosch double iridium plugs. Since that was when I bought the car I had no benchmark for how much mpg I was getting and ended up getting about 200 miles per 12.5gal. I just assumed something was wrong but didnt have the time for it until about 2 days ago. I started getting 260 miles out of that same tank for some reason. A day later I found my coil packs backing out and pushed them back in and torqued them again. Since then ive been getting the same, awful mileage again. Any Ideas? There are no check engine lights or obvious signs.

16 posts - 8 participants