Although you say you are getting 8248Kbps (that is 8.25Mbs) that is not a constant speed.
This speed will change over the day as the internet gets busier and quieter.
So if you did the test during the night (when nobody else in your area was using the internet) you may get a better speed, if you did the test at say 7pm in the evening you would get a different (probably worse) speed.
Try running the test a different times of the day, and even different days of the week, to get a "true" measure of your broadband speed.
Note your upload speed is always FAR less than you download speed.
vehelpfulguy - would you expect that to apply to virgin cable broadband as I was testing my speed regularly at different times on different days for a study carried out by Computer Active, and my speeds never altered one little bit.
It was exactly the same at 2am on a Wednesday and 10pm on a Friday.
Virgin does still have a contention ratio so yes if enough people local to you were using their virgin broadband at the same time at full capacity the speed will (and does) fall.
I've just moved, but did have the 20mb virgin package, my speed used to vary between about 12mb up to about 26mb and it was obviously dependent on the busy times.
although the effect is much less noticeable on virgin and if you happen to live in an area that doesn't have many virgin cable users you may not even get slowdown at all.