I must admit that these past few weeks I've gotten rather a kick out of passing Prii. They've apparently gotten more popular in the last couple of months, as I now see one or two most weeks, trudging along in the slow lane, while I'm doing around 70 mph - and 90-100 mpg 
I've found that slowing to around 55, at least on the route I regularly drive, seems to give worse mpg than my usual 65-75. And as previously mentioned, I'm usually the first away from the light
I don't think the Insight has changed my driving style all that much. I always did try to time lights, leave plenty of space ahead, and so on. If anything, I get more irritated at people who cut in ahead and slam on their brakes at lights, or who pass on the right when the left lane is perfectly clear.
I've found that slowing to around 55, at least on the route I regularly drive, seems to give worse mpg than my usual 65-75. And as previously mentioned, I'm usually the first away from the light
I don't think the Insight has changed my driving style all that much. I always did try to time lights, leave plenty of space ahead, and so on. If anything, I get more irritated at people who cut in ahead and slam on their brakes at lights, or who pass on the right when the left lane is perfectly clear.