TomTom GPS has unveiled an interesting new feature for some of its models that will direct you to the gas station with the least expensive prices.

TomTom just introduced what they call a 'PRO' series designed for the mobile workforce. The first two models in the series are TomTom PRO 4000 and TomTom PRO 8000 which will cost $330 and $460 respectively. As far as hardware there's no difference fr...