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They look fairly efficient, but I had a 240 and a 260Z and the aero was terrible. You could actually feel the wind resisting the car and they had all kinds of stability problems at speed. Much like a truck, actually. I find it interesting that the ducktail I had on the 260 decreased drag—I thought it just helped keep it from wandering so much. I'm also surprised the headlight covers didn't do more as much of the wind resistance and wandering seemed to come from that area. Never drove one with the covers, but I guess there's little difference according to the wind. The flared fenders actually decrease drag, which is amusing as the wheel wells were such an aero disaster that I guess just keeping some of the air out of there is worth the penalty in frontal area.
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