Measures to meet these targets include tighter automotive emissions standards, and requirements for renewable energy as a proportion of electricity production.

Eventually, however, falling hardware prices and tighter emissions standards caused fuel injection to supplant carburetors in new-vehicle production.

Mitsubishi was to continue knock-down production of vehicles derived from the CJ-3B design until August 1998, when tighter emissions and safety standards finally made the Jeep obsolete.

Designed and built during the era of the gas embargo and tighter emissions, this engine family were meant as "economy" V8's.

Yet the company is lobbying against tighter emissions and fuel-economy regulations as unrealistic.

Motor vehicles powered by diesel engines are scheduled for tighter emissions legislation over the next few years.

Though not a huge advance for smoothness or quietness, the "mod" V-8 was more easily tuned than the old 302 for the tighter emissions limits then coming on the scene.

The reasons for this difference came down to price pressures of the American market, and tighter emissions regulations.

The Bongo III went on hiatus between October 2011 and January 2012, due to tighter emissions rules, but reemerged with a Euro V compliant engine.

Ford says that even if converters without platinum are practical now, tighter emissions standards might require platinum to be reintroduced.