An ad war is brewing as Nissan is attacking the Chevrolet Volt for using a petrol engine.

Nissan North America has unveiled a new ad campaign that asks "What if everything ran on gas?"

Created to promote the Leaf, the commercial takes a humorous look at the advantages of electricity.  More interestingly, Nissan takes a swipe at the Chevrolet Volt which is a range-extended electric vehicle that uses a petrol engine to extend its 25 to 50 mile (40 to 80 km) range on electricity alone.

Nissan will begin airing 15-second teasers later this week, before debuting the full commercial on June 12th during the NBA Finals.