Drop in Fuel Economy During Winter
A noticeable drop in fuel economy during winter in a 2020 Ford Mustang is often due to seasonal factors like cold weather, increased idling, and winter fuel blends, but could also indicate underlying issues such as faulty engine sensors or low tire pressure.
Diagnosis Details
Possible Causes
Cold weather effects: Denser air, longer engine warm-up times, and increased use of heaters reduce fuel efficiency.
Winter fuel blend: Seasonal fuel additives reduce energy content, lowering MPG.
Underinflated tires: Cold air reduces tire pressure, increasing rolling resistance.
Faulty oxygen sensor or coolant temperature sensor: Incorrect readings can cause rich fuel mixture.
Sticking brake caliper or dragging brakes: Adds parasitic drag.
Related OBD-II Codes
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What You Should Do
Check tire pressure and inflate to recommended PSI.
Ensure proper winter-grade oil is used.
Inspect air filter and replace if dirty.
Monitor for check engine light; if present, scan for codes.
Consider a professional fuel system inspection if issue persists.
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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.
