Thumbs up: Moving forwardIndy's efforts at greening city operations received a $318,300 boost from the U.S. Department of Energy's Clean Cities program and the Indiana Office of Energy Development. City officials announced Monday plans to retrofit eight trucks to run on propane, which they said costs an average of $2.50 per gallon. It will result in a 24 percent reduction in the vehicles' carbon emissions with 90 percent of the efficiency of unleaded gasoline. In addition, the money will underwrite the purchase of 25 2011 Ford Fusion Hybrids to replace older and less-efficient Crown Victorias and the conversion of 11 vans to bi-fuel propane systems. The city's efforts are also benefitting from the innovative work Indiana-based companies are doing on electric vehicles. Manufacturer THINK and Greater Indiana Clean Cities Coalition donated five electric vehicles made at THINK's Elkhart-based manufacturing facility.