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Green Transportation Basics is a guide to greening your personal driving habits by dramatically improving the efficiency of an existing vehicle using simple measures such as trip planning and regular maintenance to improve fuel economy. This handy guide also explores the most promising new green cars and trucks, including electric vehicles, hybrids, plug-in hybrids and natural-gas cars. And it critically examines sustainable fuels including ethanol, biodiesel, straight vegetable oil, hydrogen and biomethane, evaluating each according to a set of established criteria. Each green fuel source must: