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I think GPS is the most under utilized tool for improving fuel economy. when I plotted all my normal routes I discovered that most of the time I was not going the shortest way. If you drive 7 miles to work every day and can find a route of 6 miles that is about 14% in fuel savings.
If you go to several places use your GPS to plot the most efficient route and order. Not all GPSs do route-planning but a lot do. You can easily save 20 - 25%.
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