I've recently replaced plugs and air filter on my 2011 TL with the 3.7. I did not replace the coil packs because I don't think it's necessary at the moment. After replacing those parts..... I'm only getting 10.3 MPG. I would appreciate your guys input what else I could do to increase my fuel Economy. The car has 105k......

 

did you use NGK laser iridiums? check if the air intake boot was cracked? with 105K you are due for timing belt service when was that last done?

 

02 sensors can get lazy!

 

Yes, I used NGK laser iridium plugs. What I found interesting though, I pulled out denso plugs. No cracks in the boot. I'm the second owner and when I brought the car it had 70k, so I'm not sure if the timing belt was replaced yet.

Thanks man, never thought of 02 sensors.