I'm assuming that all the data information will be customizeable by the user.
In other words, the user can input their own data such as wind speed, frontal area, barometric pressure, rolling resistance, weight, hill grade etc.
This would allow the user to input more accurate data rather than going off of information from , for example, the barometric pressure that is posted online at the time from an airport nearby.
I would now have an excuse to purchase the portable weather station I've been looking at for years for just this purpose !
Shop AcuRite Wireless Digital Weather Center Thermometer at Lowes.com