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You need to enter your city and highway mileage. It probably has an algorithm to calculate what the average person using normal driving habits would do. It would also be a good baseline to compair your results to the computer's calculations.
Over time I bet that you could tweek the city/hwy variables in the computer to match what you are actually doing. Start with what your car actually gets with your drivning style for city and highway it would probably come fairly close +- a couple of mpg. It is a garbage in garbage out computer, but given the correct variables it has the potential to be very good.
It would no doubt work well for choosing a route. For guys like me with pre-OBD-II ecms it is a good place to start. Also it would be great for those can't or don't want to build and install a custom fuel computer. I have to applaud Garmin for their effort.
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