I just returned from a trip where I had tried a few of the tips I've read on these forums. I was able to do some EOC in a few spots as well as some P&G. The downside is that the wind was so strong the coasting and gliding suffered because speeds would rapidly decline even when going down hill. I had also hit some speeds of 120 km/h (74ish mp/h) although the average was between 100-110 km/h (60ish mp/h). On the way back, I had to traverse a hill that rises close to 800 meters ASL. Anyways, I was able to achieve 47 mpg in my little Festiva.
I had slowed down and practiced more EOC on the way home with little to no wind. I just need to fill up and figure out the mileage. Should be better considering I didn't have to climb Hungry Hill again! Pretty good considering a real lack of aerodynamics involved in this boxy little brick.
I had to fill up part way from the trip taken the other day and have recalculated my mileage after milking things a bit. Some EOC and coasting as much as possible on all the little hills (not EOC, just coasting). This resulted in 53.5 mpg. In terms of costs, that works out to $.06/km ($.09/mile) and I'm getting paid $.44/km. Pretty happy with that. I'm really not too sure I can top it, but I'm going to give it a shot