Winter Fuel Economy Drop
A drop in fuel economy during winter is common due to increased engine warm-up time, cold air density, winter fuel blends, and potential issues like underinflated tires or a faulty thermostat.
Diagnosis Details
Possible Causes
Cold weather increases engine friction and warm-up time, reducing efficiency.
Winter fuel blends have lower energy content per gallon.
Underinflated tires due to cold temperatures increase rolling resistance.
Faulty thermostat causing engine to run colder than optimal.
Oxygen sensor or MAF sensor issues affecting air-fuel mixture.
Related OBD-II Codes
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What You Should Do
Check tire pressure and inflate to recommended levels.
Ensure engine coolant is at proper level and thermostat is functioning.
Consider using a block heater to reduce warm-up time.
If problem persists, scan for diagnostic trouble codes and inspect oxygen sensors.
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.
