I was around 15mpg when I first started tracking my mpg. Since then I started coasting more and slowed my average highway speed from 75 to 70. Less use of the brakes when safe or extremely annoying to those behind me and I was hitting 19-20 highway until I put my roof basket on, now it's like 17-18 highway. Then city has gone from 12-13 to 15-16 with more coasting, limiting bat out of hell takeoffs (I still have to do them occasionally, I'm not driving like a granny here!) and using idle to get me going before traffic actually starts moving