I agree with those who enjoy driving slow. I used to cruise at about 5 - 10 mph over the speed limit. Then I discovered this site and the whole hypermiling thing. Now I go about 5 - 10 mph under the limit. In addition to saving gas, this lowers road noise considerably, gets rid of a bit of a steering wheel shudder I feel at higher speeds, and just makes the drive more enjoyable in general.
That said, the longest trip I've done this for is about 60 miles, so driving slow only costs me a total of 10 or 15 minutes. For a much longer trip, I would probably want to spend the extra dollars to get to my destination that much faster.
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