XATANET is an electronic system that combines GPS, trip planning and real-time fuel performance in a display a driver can see during operation. XATA says that drivers can, "use this information to alter speed, braking and gear shifting to improve fuel economy at the point of immediate impact. Fuel costs are further reduced by the ongoing interaction that occurs between drivers as they continually work to improve their personal fuel economy ratings". I like that, the idea of drivers sitting around a truck stop boasting about how much fuel they didn't use today.
[Source: XATA Corporation]