Ok, I'm willing to admit, I just have no idea what's going on and I'm willing to admit I may be a victim of snake oil. My mpgs have been steadily decreasing for about 30 000 kms. Here's what I've done to my 2014 3.6 (it's got 120 000 km) New sparkies 5000km ago. K and N drop in filter (used and cleaned for 115000km) Throttle body spacer (used for 100000km) Moved cities (driving is the same but have been driving that for 10000km) I use RP oil and change every 6000km I'm getting an average now of 19 mpg, I used to get 24+ all the time. What gives? Are my cats slowly clogging? Should I try removing the throttle spacer? Add a cold air? I'm wondering if more smog creates worst mpg and how to combat that. I need that mpg back. Any ideas or experiences are appreciated.