[San Diego]

I'm curious. Where is the cold air engine intake for a 2020 Honda CRV Hybrid? II bought the car new and get it dealer serviced. The car now has 35K miles. I have seen 37MPG then it starts dropping off (now 36.2). I changed the air filter and noticed oily dirt on the filter! The car is a highway car, no off roading. After the filter change the MPG went up to almost 37 and now its dripping off again. I dont get the oily filter part! Its like the cold air intake is underneath the car vs someplace it can get clean air. .