I got my Malibu October of last year, and found this website about February of this year and have been trying to improve my driving and FE. I get regular oil changes and tune ups. I had a job for 3 months driving 140 miles every day, heavy traffic. For the last 6 months I've been driving 60 miles round trip to another job, with light/moderate traffic in the morning and moderate/heavy traffic in the afternoon. I can avoid some of the heavy freeway traffic on the way home by taking a detour through a city, 35mph speed limit, many stop lights. Until 2 months ago I was averaging about 36-38 mpg. Since then however my FE has dropped significantly, down to around 32 mpg, and my driving has not changed much in that time. Any ideas as to what kinds of things can cause drastic FE drops like this? Any other suggetsions as to how to improve FE for my trip?