This post originally appeared on Orphan Road.

Metro is ordering a whole slew of new hybrid buses to help deliver the Transit Now service improvements.

You’ll recall the first batch of hybrids was rolled out in 2004. However, the P-I reported in December of that year that those buses failed to show significant fuel savings. They were, however, more reliable and helped to lower maintenance costs.

Still, Metro is a little more cautious in touting the energy savings this time around:

Metro currently owns 214 articulated hybrid buses, the largest such fleet in the nation. A National Renewable Energy Lab study found articulated hybrids provide a 30 percent reduction in greenhouse gases and are 40 percent more reliable than diesel fueled articulated buses.

Notice there’s no direct mention of fuel savings. The reduction in greenhouse gases could simply be that the new buses use a cleaner diesel blend than the older ones.