You could not be more wrong! Efficiency and overhead are measured as a percent of frame size and 128-byte packets (X.25) or 48-byte frames (Atm) are abortions. 1500 bytes at the outset and the overhead is < 1% and < 0.2% with jumbograms (8kB). Every 802.11 standard is a superset of Ethernet and that makes DIX Ethernet the most scalable network protocol of all time!