A few years ago a little-known US Energy Department program helped produce a design technology for lightweight cars and trucks that in 2004 alone saved the nation 122 million barrels of oil, or about $9 billion. So, with energy prices spiking and President Bush pushing for more energy research, the ITP would seem a natural candidate for more funding. In fact, its budget is set to get chopped by a third from its 2005 level. It's one of more than a dozen energy-efficiency efforts that the Energy Department plans to trim or eliminate in a $115 million cost-saving move. If Congress accepts the Energy Department's proposed 2007 budget, it will cut $152 million - some 16 percent - from this year's budget for energy-efficiency programs. Adjusting for inflation, it would mean the US government would spend 30 percent less on energy efficiency next year than it did in 2002. One energy-efficiency program on the chopping block...helps improve the fuel efficiency of heavy-duty trucks, one of the nation's biggest oil consumers. That program is zeroed out" in the 2007 budget request. The same fate awaits the $4.5 million Building Codes Implementation Grants program. It helps states adopt more energy-efficient requirements for new buildings, the nation's largest consumer of electricity and natural gas. The $8 million Clean Cities program has helped clean-fuel technologies, like buses that run on compressed natural gas, get to market. But it's slated for a $2.8 million cut.