[JBott656]

Thank You. It's just weird right after they flushed the transmission when it wasnt cold the mileage starting dropping. The tune up was more recently when it got colder. I drove over 500 miles of nothing but highway and milage started out at 26.4 by the time i returned it was 25.8. It was all highway. In the past when car was newer after these highway trips sometimes the mileage would go up to 32 and then slowly drop after returning to normal driving down to about 29.5. After the transmission flush about 6 months ago the mileage dropped to 26 and has never gone back up. Is it the high mileage 121,000? Car shifts fine I'm pretty sure flush was fine. The shop says flush would not affect mileage. They suggested tune up and new air filter. After tune up which was done in this cold weather i have still seen no change. Should i try additives to gas ?