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I listen for the sound of air rushing past the car. On a no-wind day there's a distinct increase in sound between about 60-63 mph. Of course it gets gradually louder as speed increases but there's a major increase in the low '60's. Of course every car will be different but you can listen for the sound of rushing air. More sound = more turbulence = reduced FE.
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It's really helpful when you have a leaky door and you hear wind noise
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No FE instrumentation in my '89 car.
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Mine is my leaky door
