http://www.racer.com/mobile/topic/18036/ Articles tagged with Mobile from Racer.com Racer custserv@haymarketmedia.com no "When you see us driving in packs during practice, it isn't just to measure the effects of the draft on your straight-line speed; it's to see how running in dirty air speeds up tire degradation, or how running up close to the car in front improves your fuel mileage." http://www.racer.com/will-powers-blog-building-the-perfect-beast-for-indy/article/241913/ Sat, 19 May 2012 13:59:00 GMT "When you see us driving in packs during practice, it isn't just to measure the effects of the draft on your straight-line speed; it's to see how running in dirty air speeds up tire degradation, or how running up close to the car in front improves your fuel mileage." Racer