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Just to give a little more details, when my dad lane changed and no one was infront of me for a long ways, my mpg dropped a bit, around 37-38ish and once I got behind him again, it went up to the normal 40ish. On the 2 lane highway, it was much less traffic, and lower mpg, somewhere around 35mpg while following. I have not gone 70mph on the 2 lane highway with out following someone with my car, so I'm not sure what the normal figures are.
The trip to where the Camry was my dad drove with cruize control and averaged 34mpg with out following anyone and traveled around the same speed. I blamed it on his dead weight and quicker take offs until I thought of the drafting / false wind effects.
On normal back roads, I have noticed small increases when someone passes me. I'm not sure if i'm letting off the gas, or if there is an actual aero benefit of someone passing you. I didn't really watch the condictions that well, so it could have just been a little down hill when they passed as well.
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