Over half of my miles are on the track, so its worth it for me. It does cost me mileage. I don't drive enough on the street to really know how much, but I got 22 on the way up to Road America in October.
I do know that when trailering my car, I have lost 2mpg in the tow vehicle. Future long trips will have me unbolt the wing and put it in the car next season.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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