(February 21, 2022 at 5:53 am)Jehanne Wrote: We just bought a 2020 Mitsubishi Mirage G4, a 3-cylinder car. In cold weather, it can get as low as 10 mpg, warmer weather over 40 mpg.
I would bet money there is a problem with the cold start circuit.
It would be easy to verify - by pulling the spark plugs after running in cold weather. Blackened, sooty appearance indicates an over rich condition - likely caused by the cold start mixture staying on.