To get the best possible fuel economy, change your air filter with every other oil change and check tire pressures regularly especially during the cold winter months. A dirty air filter can equate to 15% more money spent at the pump. Also if your check engine light is on it could possibly mean that your O2 sensor is failing and if so could result in a loss of up to 40% in fuel economy. "Get rid of the junk in the trunk" is what I always say because the extra added weight you're lugging around makes your vehicle work harder which can also lose mileage. For those of you who live in the area, I am always available for a complete vehicle analysis.

I hope this helps! Cheers!

Car Doctor