Bought new 2020 XLE in Aug. Mileage has gone from mid 50s to mid 40s. Same settings and driving pattern. Any ideas?
Outside temperature, tyre pressure (related to outside temperature), switch to winter blend fuel at your local gas station.
Winter: Why Mileage Gets Worse in the Winter | PriusChat Do recheck those tire pressures, and pump up if necessary.
Upon what do you base those numbers ? IF.....you are watching a long term average displayed by the car, it is just getting down to a realistic average.