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Top speed is down because they need to coast. They start doing it near the speed trap. So they're already slowing down. The timing and scoring data doesn't show the real top speed of these cars. But it isn't as fast as before, definitely. I think that will change if the rules allow for engine efficiency to significantly improve. There's ways to do that like allowing for cylinder deactivation and vvt, and possibly better grades of fuel. Even the 3 ers's could have a big impact. That means less lift and coast and more full throttle, resulting in top speed increases. Then of course aerodynamics will be a really big factor.
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