[Blue07CivicEX]

If you find a truck (big rig) doing between 60-65 if you feel safe tuck in behind them about 3 car lengths away. You have to pay close attention for any debris that might come off the back tires but doing this you can get nice long glides and some EOC'ing on good hills but you have to be careful and watchful of what's going on.

Also, look for places on your car that are low hanging fruit for streamlining (big holes under the car that could be easily covered). I did minimal modifications on my civic (just the fog covers and lower grill block so far) and was able to hit just under 47mpg on a 300 mile trip. You should be able to easily get up this high with some tweaking.