It's hard to say how I've done it, I don't have a solid routine when it comes to driving. The big thing I do is go 60 mph when I'm on the highway, I use CC but there aren't many hills here, I also try to limit AC use (the tank I'm on now is doing really well (60.5 mpg) because I've been doing most of my driving at night so it's cool and I don't have to use the AC... but also becuase the drive is perfect).