At my wits end with my 2005 9-5 aero's fuel economy.
After hearing several other suggestions on how to increase my mpg a common one was the DIC, I had a crappy Pro-Parts one and the CEL came on so I went and brought a brand new Saab OEM DIC, this did not change my mpg whatsoever, I am still getting 13-15 mixed. So far I have cleaned the MAF and Throttle body, changed spark plugs (NGK 6290), changed fuel filter, new air filter, new oil (0W-40), good gas, Fuel injector/fuel system additives and brand new Good Year Eagle Sports. I'm a high school student and gas is very expensive near me so there are days I walk to school just to save gas so any suggestions at this point will help, one of many reasons I bought this car was so I could have a performance saloon and still not break the bank of gas but so far that's not happening.