As the weather gets colder, fuel consumption can increase even in a properly functioning car. The engine takes longer to warm up, and lower tire pressure increases rolling resistance.
Fuel consumption in autumn: six reasons for an increase
Lower tire pressure. In cold weather, pressure drops, which increases rolling resistance. It should be checked on cold tires, following the car manufacturer's recommendations.
Prolonged idling warm-up. At idle, the engine consumes fuel even though the car is not covering any distance. This raises the average consumption per trip.
Cold engine operation. Chilled oil and other technical fluids increase friction. Until it reaches operating temperature, the power unit operates less efficiently.
A faulty thermostat. If it is stuck in the open position, the engine may become overcooled. According to the explanation from parts manufacturer Gates, this increases fuel consumption and worsens cabin heating.
A roof rack or roof box. Additional equipment creates air resistance. This factor applies at any time of year, so an unused roof rack should be removed.
Short routes. During brief trips, the engine remains unheated for most of the time. Several separate outings with a cold start may require more fuel than one combined route.
Checking the car: where to start
First, you should check the tire pressure, remove unnecessary equipment from the roof and reduce idling. If the engine does not reach its usual temperature, diagnostics of the cooling system are needed.
"Colder weather affects consumption, but it should not be used to explain any increase: a faulty thermostat may also be the cause," notes the author of the material, Oleksii Astapov.
