Tire pressure makes a huge difference. My 2022 arrived from Honda at about about 38-39PSI and I left it that way. I'm averaging 5.0L/100KM. Others in this forum are pushing up to 45 PSI to get these crazy MPG ratings but i would not recommend going that high as it is right at the edge of the tire spec + it's an awful rough ride and you feel every bump like it's a pothole. I think you could probably go to 36-37 and be fine tho.Yeah, tire PSI is correct (spec 33PSI - I'm at 34PSI cold). AC yeah, probably. But that's a bigger dip in mpg than any of my prior cars (non-hybrid). Hopefully it will improve once the heat reduces.