Q: Fuel inefficiencies

asked by on

I seem to be going through gas like it's water. After filling up, I begin to see the needle go down only after 20 miles of driving. It used to be over 50 miles before the needle went down. What's causing fuel inefficiency?

My car has 114500 miles.
My car has an automatic transmission.

In order to check your fuel economy you will need to fill your fuel tank completely and zero your trip meter and drive vehicle until you use at least a half tank of fuel and then fill the tank and take the miles driven and divide the gallons it took to fill it up to get the mileage per gallon you got. This will be your combination miles per gallon between city and highway. If you did not get more than about 16 miles per gallon then have your computer tested for stored codes and check data for O2 sensor performance to see if you may have problems. You should check to make sure you have a clean air filter and tune up if not done before recently. Have a mechanic like one from YourMechanic check the systems for you if no noticeable problem was found with low fuel mileage. You may have a mass air flow sensor that needs cleaned or problems with variable intake manifold.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Fuel inefficiencies

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Engine light goes on and off

Usually there are two instances where we see a check engine light appear on and off as you describe the first involves the Check Engine Light coming on and staying lit. The vehicle will drive as if there is no...

Q: What does the check brake system warning mean in the message system?

Your car is equipped with a number of different sensors designed to monitor critical systems for malfunctions and problems, including your brakes. If you see a warning message that reads “Check brake system” come on in your message center, it...

Q: Can you direct me to a how to video on how to change a coolant by-pass valve on a 2014 ford escape

In order to change the coolant bypass valve, you will first need to locate the thermostat housing. Once the thermostat housing has been located, the bypass hose is going to be the smaller hose that goes into the thermostat housing....

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.