Lots of things.
MPG drop
do you want a wall of text, ?
i can list 100 causes.
but here is my short list
1: too heavy right foot.
2: car needs service,.
3: measuring MPG wrong.
4: wrong tire pressure.
5: gas theft from your tank.
ever google such a endless topic.
here
read this and the answer, and posters
most are correct.
http://www.carsdirect.com/car-buying/8-main-causes-of-bad-gas-mileage
google (or the like) is your friend,
there are 1billion cars on planet earth and this topic is like #1 and the most complex of all . MPG.
To many things will cause fuel mileage to drop. First thing to do is read the codes(write them down). Erase them, them read them again. If it a code comes right back, check it first. No codes, drive it for 10 minutes or so, Check codes again. If they reappear check them . Some codes only come back after driving two times.
2.2L VIN D engine Firing order: 1-3-4-2 Distributorless ignition system
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