17 is on the low side especially for combo driving city/hwy. i usually just run around town and get 21-22 mpg just city and can get as much as 31 on the fwy only runs.

 

Keep in mind that the tank size is irrelevant when it comes to fuel economy; the metric we really need is how many gallons you typically put into the tank every time you fill up. Better still, track at least two or three tanks with the exact miles driven and the exact amount of fuel added when you fill; add the miles and gallons, and then divide the total miles driven by the total number of gallons consumed.

Also keep in mind that even the most fuel efficient car in the world will return less than ten miles per gallon given enough excessive idling and/or driving in very heavy traffic.

Another factor to consider is how long you operate the car every time you start it. If you start, drive two miles and then turn in off, your mileage will be poor regardless of what car you're driving due to the fact that a cold engine runs excessively rich.

 

Thanks for your response. I filled 18 gallons last 3 times and set the odometer to 0. Exactly at 300 -305 miles, I filled the tank and it took 17.5 to 18 gallons. This must give the results, right.

Also, I do drive 2 miles one side daily to office. You think that would cause this much issue? Also, I had 10 years old honda accord before and the it used to give more than 22 miles per gallon for the same daily commute.

 

Your car has an 18.5 gallon tank and you're putting in 18? Are you "milking" the pump and filling to the brim, or are you pulling the pump handle out after it clicks off the first time? Note, filling beyond the auto click off can damage the evap system in your car.

As for your two mile commute, yup, that's a huge reason why your fuel economy is bad. Take your car on a road trip and you'll most likely get over 30 mpg.