I'm filling up way more often than I used to
A sudden drop in gas mileage is usually low tires, worn spark plugs, a bad oxygen sensor, or a brake that is dragging. Driving habits and heat play a part too, since Miami traffic and a full blast AC burn more fuel. If the drop is big and sudden, something changed on the car.
Urgency
This week is fine
What to do right now
What to do right now
- 1Check tire pressure on all four and fill to the number on the door sticker.
- 2Reset your trip meter and track a full tank or two so you have real numbers to share.
- 3Take extra weight out of the trunk and make sure the check engine light is off.
What it usually is
What it usually is
Tires
Low or worn tires add drag. Proper pressure alone can bring back part of what you lost.
See the serviceTune-up and spark plugs
Worn plugs and a dirty air filter make the engine work harder for the same drive.
See the serviceCheck engine light
A bad oxygen or air flow sensor makes the engine burn extra fuel. It often stores a code before the light even comes on.
See the serviceQuestions people ask
How much does running the AC hurt my mileage?
It does use more fuel, especially in slow traffic. But in Miami heat you need it. If your mileage dropped more than the AC explains, look for another cause.
Can a dragging brake hurt gas mileage?
Yes. A caliper that does not release fully is like driving with the brake lightly on. One wheel often feels hotter than the others after a drive.
Does idling in traffic on I-95 count?
Yes. Sitting still with the engine on gets zero miles per gallon. Long stretches of stop and go will always lower your average, so compare the same kind of driving week to week.
I drive rideshare. What should I check first?
Tires and plugs. High miles and lots of idling wear both fast. Catching them early can save you real money at the pump.