Drop in Fuel Economy During Winter
A noticeable drop in fuel economy during winter in a 2020 Toyota Camry is common due to colder temperatures, increased engine warm-up time, and potential issues like underinflated tires or a faulty thermostat.
Diagnosis Details
Possible Causes
Cold weather increases engine warm-up time and reduces tire pressure, leading to higher fuel consumption.
Faulty engine thermostat stuck open causing engine to run cooler and less efficiently.
Winter blend fuel has slightly lower energy content, reducing mileage.
Oxygen sensor or MAF sensor malfunction causing rich fuel mixture.
Related OBD-II Codes
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What You Should Do
Check and inflate tires to recommended cold pressure.
Ensure engine reaches normal operating temperature quickly.
Consider using a block heater if parked outside.
If issue persists, have a mechanic test the thermostat and scan for trouble codes.
Related Repairs
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.