New Delhi, Sept. 18 -- India's top energy efficiency agency feels frustrated as the dialogue with the nation's largest auto lobby has stalled over the new fuel efficiency norms, delaying final rules that aim to cut carbon dioxide emissions from vehicles.

The third edition of the Corporate Average Fuel Efficiency (CAFE 3) norms was expected to be finalized by this month, according to four people aware of the matter. Yet, the Society of Indian Automobile Manufacturers (Siam) has not submitted its feedback even within the extended period, the people said.

The Bureau of Energy Efficiency (BEE) is unhappy that the auto lobby has neither fully cooperated nor sorted out differences within the grouping over demands for partial relief for small ...