Yes, it should. On a typical wireless network, you can expect to get around one-half of your synced speed in actual transmit. So if you are synced at 24mbps, you can expect to get a maximum of around 12mbps out of it. That is not a perfect rule, but for a standard G network in an office setting that is around what you can plan on.
There are numerous issues with standard wireless networks, which include but are not limited too transmitted signal level, return signal level, interference at the AP, interference at the client, multipath (self) interference, fade margin, receive sensitivity at both AP and client and a horde of others.