Light in fiber is only 1 millisecond slower http://www.wolframalpha.com/input/?i=distance+from+washington+d.c.+to+chicago+%2F+speed+of+light+in+fiberoptic+cable

Where do you get the 7 millisecond figure from? http://www.wolframalpha.com/input/?i=distance+from+washington+d.c.+to+chicago+%2F+speed+of+light+in+fiberoptic+cable says it's 4 milliseconds from Washington, D.C. to Chicago by fiberoptic cable.