In Detroit in 2006 GM presented the E-Flex electric propulsion technology in the Chevrolet Volt Concept. Since then they’ve been releasing communication around the technology, this concept and other concept vehicles (e.g. the Opel Flextreme).
The funniest piece of consumer driven comms that I have seen so far is the following TV ad:
Chevrolet Volt Concept – Dog [00:31]
I am still not sure wether this is real ;o)