Fuel-efficient vehicles enable car owners to save you money on gasoline costs, reduce greenhouse gas emissions, and decrease oil dependence costs. Correctly maintained cars will retain their fuel efficiency, so if your vehicle’s gas mileage drops, bring it to your trusted mechanic to identify the issue. Here are three common factors why your car’s fuel efficiency may be decreasing.

3 Issues That Significantly Reduce Car’s Fuel Economy

1. Bad Oxygen Sensor

The oxygen sensors in your exhaust system supply data to your car’s Powertrain Control Module (PCM), which maintains an optimal air to fuel ratio. When the sensors fail, the fuel mixture is disrupted and causes excessive gas to enter your engine, increasing your intake and decreasing mileage. 

When your engine light turns on, or you the gas mileage decreasing visit your trusted auto shop. Also, pay attention if your car misfires, stalls, or releases odors akin to rotten eggs. Asking your mechanic to pinpoint and replace a faulty sensor can enhance your fuel efficiency by up to 40%.

2. Incorrect Tire Pressure

Underinflated tires worsen your automobile’s drag, requiring more fuel to move the car. Low air pressure decreases your gas mileage by 0.2% per 1 psi drop in your wheels’ average pressure. Properly inflated tires will enhance fuel efficiency from 0.6% up to 3%. 

Ensure that your front and rear tires are at their required pressure levels. Your car’s recommended PSI is listed in the owner’s manual, on the sticker in the driver’s side door jamb, or in your glove box. If you don’t have a digital tire gauge, ask your mechanic to check the pressure and refill your air.

3. Frequent AC Use

During hot days, conventional car air conditioners can shrink its gas mileage by over 25%. Some car owners roll their windows down to let in some fresh air. However, this intensifies wind resistance and aerodynamic drag, forcing the car to consume more gas.

For optimal fuel economy, turn off your car’s AC or use it less. When running your air conditioner, find a comfortable temperature, and avoid setting it too low. During summer, use your AC when you’re driving fast, but roll down your windows at slower speeds.  

When you notice your car’s gas mileage drops, let the ASE-certified mechanics of Hudson Goodyear inspect your vehicle. This family-owned and operated auto repair shop in Hudson, OH, specializes in tire services, wheel alignment, preventive maintenance, and engine repairs. Visit their website to learn more about the company or call (330) 650-8888 to ask about their warranty and financing options.