INternet speed difference between iMac and MBP

I have an imac 27" that is barely one year old and a three year old MBP. Today, I signed up for faster Fios internet service which is supposed to be a maximum of 25 Mbs both up and down. I then checked the speed on my iMac and see I am averaging about 10 Mbs down and about 8 Mbs up. I am not that concerned that I am not getting the theoretical maximum performance. For one thing I am not hardwired to my router but am using wireless g. I also ran the Mac internet tuner that seemed to actually increase the speed somewhat.
I then checked my MBP that is sitting right next to my iMac. I am getting around 15 Mbps down and about 17 Mbps up. I repeated this several times as I did for the iMac. I am surprised at the iMac being so much slower (about 33% slower). I can only assume the hardware in the MBP is better for wireless communication than in the iMac. Can someone explain why this is so?
thanks,
Shannon

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