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"The TT has 148 pounds of lift at the rear axle at 125 mph without the spoiler, but only a 53-pound lift when the spoiler is fitted."
Twice the speed, four times the drag/lift/down force. So you will be doing 60 or so with a Tempo on the highway. (hopefully) Your car is not shaped like the TT and will not generate that much lift. But assuming it does, at 60mph you will have 36ish pounds of lift. Which probably makes your 1,000 pound rear end weigh 964 pounds. Not exactly something to be concerned about. Is your car even rear wheel drive?
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