That's why personally I'm going for a time rather than a speed.
Where did the ford find 3km of straight flat road?
Also I think it's great to be able to wind out gears, regardless of what speed they get to, in a legal and safe environment. Try it on a freeway and if you're caught that's it, life over. So the way I figure it, doing this thing is a no brainer and between runs watching the other 100 or so cars launching will be damn good aswel