Trying to think green when buying a car? Whether your new fuel-efficient engine helps or hurts the warming planet depends on where you live and what you're putting in the tank.
New cars aim to deliver high performance with maximum fuel efficiency, making them easier on both the environment and the wallet. To do this, auto manufacturers are adopting a smaller, more fuel-efficient engine type, called gasoline direct-injection (GDI) -- between model years 2009 to 2015, the percentage of new vehicles sold with GDI engines jumped from five to 46 per cent.