I did a return trip of 240 miles and returned slightly worse economy going through WV. I kept the car in gear the entire time, stayed roughly the same speed. I got 31.9 mpg. The first part, I got 34. The only difference was there was LESS traffic on the return trip than before. Maybe a few degrees in temperature, too. There are huge grades here in WV that you can really coast on, with engine braking not so much coasting. In neutral I can easily coast at least a full 10 miles of the trip. And in several locations I will get going 80 mph in neutral before I put it in gear just to slow back down some.
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