I just changed the oil in my 09 and the change oil light nev er went off. So I looked in the owners manuel to se how to rest it, and came across the part where you have to turn the acc. On and depress the gas peddle 3 times, the turn the key to lock. Worked, but now im getting a wooping 14 maybe 15 mpg. Any thoughtz?.. I have checked fluids and filter... All good