I don't know how much difference there is between Michelin Defenders and Michelin Energy Savers - but for what it's worth I absolutely loved the Energy Savers that are on my first Insight. They look no different now than when I bought the car, and neither my son or I have any complaints as far as drive-ability. The car has at least 15,000 more miles on it now and I can't tell any difference in the tires.
I pull the same mpg driving Turtle as I do in Ron Burgundy, which has the Potenzas on it, so there's not really an mpg hit with the Michelins.
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