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Regardless of what you may have just read, Ram air has a real effect even at 65 to 70 mph. I calculated it out once for my Mercedes and cam up with a figure of ram air increasing power output of my engine by at least 1/3 of a hp at 70mph. Since my car is a diesel that more than 1/3 of a hp came at no expense of fuel consumption.
With a gas powered car your mileage may vary but it should be a positive effect.
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