An Iowa State University (ISU) researcher says a study of hybrid school buses shows some promise for decreasing fuel costs and pollution, if mechanical problems with the buses can be fixed, Radio Iowa reports. Two hyrbid-electric school buses were purchased for the Nevada and Sigourney school districts and run alongside regular buses. Shauna Hallmark of the ISU Institute for Transportation says there were problems with the batteries on the buses holding a charge. But the hybrid buses got 30 percent better mileage in Nevada and 36 percent better in Sigourney. Hallmark says the savings could help offset the increased cost...

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