The story....ive had my car a little over a year now and it has always got 17-18 mpg....now recently ive been getting 15.5 the past month and a half........ i dont drive any diffrent and dont drive any more or less highway than i used too.... the car does have 82k on it, bought at 69k, 6mt...... and yes its on 20s....but has always been on 20s since a month after i bought it... and i have always but once went to one of 2 diffrent chevron stations, 93 only........ any ideas???......

 

did the gas station change to 10% ethanol fuel mixture?

 

have you changed your air filter recently, checked tire pressure?

 

+1 Do you need to do an oil change?