u/Adventurous_Group_18

Bought a 2006 Honda accord. Mint condition has 203 thousand on it. Sadly really bad gas mileage 21 miles to a gallon is not good with gas at 5 dollars a gallon. Car runs excellent. What would be the first things to check out or is the engine just old and I'm stuck with 21 miles to a gallon. Checked the air filter already pretty much brand new filter. I did put a bottle of catalytic converter cleaner in it. Lol 30 bucks a bottle. But didn't help nothing. Any suggestions would be appreciated.