Apple Clarifies 802.11g Speed. Apple says, hey, it was always about 20 Mbps throughput: Bravo to MacCentral for asking and Apple for being so candid, in clarifying the fact that I knew and most folks who understand the spec know: 802.11g runs at 54 Mbps, but that's not a measure of the data encoded, but rather all of the nuts and bolts that make up a wireless network. The net data rate is somewhere at 20 Mbps or south; 54 Mbps is the raw rate…. [Wi-Fi Networking News]