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Being an extremely lightweight FF car, the Insight probably balances closer to the front wheels. The tail extension, while it does give some weight to the back, gives a lot of mechanical advantage to the wind. The weight added is negligible compared to the amount of torque introduced by wind hitting the tail normal. The sidewall grip of the rear tires should be just enough to hold the car true, though.
While the tail does add surface area normal to side winds, the Insight's tires should be able to handle the force without any tragic outcomes. I would think that the rear tires would lose friction before the car's mass over the front wheels do.
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