Also look up "hypermiling"
http://en.wikipedia.org/wiki/Hypermiler
I also draft when I can, but not too close. Many pulse and glide references are about hybrids but modern cars shut off fuel on coasting above certain speeds and this is where the benefit comes in. Basically, you save gas by speeding up to 64 and then coasting down to 60, vs cruise control at 62 for example. The basic idea is that there is a fuel "overhead" to the running engine and when you coast with fuel cutoff (happens automatically on modern cars as mentioned) you eliminate this half the time. Lots has been written about this. I don't need to. Also you can apply constant power up hills vs. constant speed. This is where cruise control really hurts mileage: up hills. You will slow down of course.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra