Clogged air filter? It would probably have to be super dirty to see this kind of efficiency drop though. A clogged catalytic converter could cause this kind of performance and mileage decrease, but you would know it because it would be struggling to accelerate all the time.I used to get 29ish on the highway, and 19+- in the city (2018 Elite). In the past year I've noticed a big drop in MPG especially in the city. Now I'm getting around 16. !!!!
One factor that I didn't consider since my original post was my tire pressure. It just alerted me that they were down to 30. I wish that threshold was set a little higher actually.Clogged air filter? It would probably have to be super dirty to see this kind of efficiency drop though. A clogged catalytic converter could cause this kind of performance and mileage decrease, but you would know it because it would be struggling to accelerate all the time.
Do you let it sit idling a lot? (e.g. to warm up or while you wait on someone to run in the store.)
Driving habits are usually the biggest impact to gas mileage. My daughter gets about 40 mpg consistently in my 2014 Civic (even in town), and I am lucky to get 27 when I drive it to work on the interstate.
Winter gas versus summer gas is also a possibility depending on when the lower mileage started.
Also, how are you calculating gas mileage? We have only had our 2020 Odyssey for a month, but we are getting around 26 on the highway and about 16-17 in town. The computer says higher than that (28 hwy and 18 in town), but actually checking miles on a tank versus gallons added comes out to the lower values.
Idling is as bad for gas mileage as driving in the city, the ODY will suck the fuel, one of the things I hated about the OTA upgrades. Why they just do not allow USB upgrades or WiFi. Just consider the time that you are stopped at the longest traffic light... do not let you ODY idle that long. I do let our ODY idle for 10-15 seconds when I first start it, the allow oil pressure to build and disperse and coolant to start moving. But during winter time, I do use the remote start, especially if it's below 32 degrees outside, and only at 10 minutes if it is in and at the single digit area, other wise it's probably for a few minutes. In my experience this ODY performs best mileage above 50 to 60 degree temperature area. We only have 300' rolling hills, so no mountains. Drier humidity in Winter, more humid in the other months. What do you expect for living in corn-field areas.I do let it idle sometimes but not often, or, it affects it more that I think. One time I did a system update, forgot to set a timer on my phone to go out and check it, and it idled for 3 1/2 hrs. OOF!
What is an AFR sensor?You don't give odo reading. AFR sensors get lazy as the miles accumulate. Some of us replace them at 100k as PM. I have gotten a 10% increase on another vehicle. If you have a tool to display live data, look at the respective voltages from the AFRSs.
The challenge is there are soo many definitions.
Add a can of good quality fuel injector cleaner e.g. Techron next fillup. Dirty injectors don't atomize the fuel as well, so it doesn't burn as well.I've noticed a big drop in MPG especially in the city.
(Question: Am I the only person who, coming across a word/term/phrase I don't recognize, uses a search engine to see if I can get an instantaneous explanation/definition?)
I tried to use your advice to see what snowflake means. I got this as the first few hits.Well, doing a reality check on myself, I used Google to search for AFR sensor, and the very first entry nailed it. Sorry, I didn't check Bing results, because it has never produced anything worthwhile.
Yes, most online parts sellers include AFR sensors under the O2 sensors category. But in this particular context, the distinction makes a difference, so I looked to be specific.