Have Subaru Questions? Ask a Subaru Mechanic and Get Answers ASAP
Hi. How long have you noticed this happening?
Ok. Has the weather changed as in getting colder outside where you live? Also do you have a remote start for the vehicle?
The effect of cold weather on the vehicle can decrease the fuel mileage. Colder air is much denser and requires more fuel. Also in cold weather usually the car is idled more, from perhaps warming it up before driving it.
The computer uses the calculation of how much fuel in the tank has been used, how far you've travelled on the tank, and the amount of accelerator pedal and idle time used to get the average mpg
Thank you for using Just Answer and please take a moment to rate my assistance with your question. And, as always, after rating the question will remain open for any follow-ups you may have. Thank you.
Please let me know if you have any more questions on this. If you could also please take a moment to rate my assistance, that would be appreciated. Thank you.