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Fuel Efficiency

FCA US is a leader in optimizing internal-combustion technology. Our migration to eight- and nine-speed automatic transmissions will further enhance the gains we’ve made in efficiency, performance and refinement.
From model-year 2011 to the present, FCA US showrooms have seen 21 new transmissions, 20 new engines and two electrified powertrains, including the award-winning 3.6-liter Pentastar Hybrid Propulsion System.​  ​ 

Gasoline Engines


The latest addition to the FIRE family of gasoline engines ¬ the 1.4-liter Turbo MultiAir II ¬ was launched in the new Jeep® Renegade and is also available in the Fiat 500X.

Its second-generation MultiAir technology  promises improved fuel efficiency and further reductions in CO2 emissions, building on the performance of the first-generation MultiAir engines, which delivered emissions reductions of up to 10%, compared with conventional gasoline engines having the same displacement.



With the addition of cooled exhaust-gas recirculation (EGR) and variable valve lift (VVL), the redesigned Pentastar has firmly established itself among the elite engines of its kind, promising fuel-economy improvements of more than 6% while increasing torque more than 14.9% where it matters most –at engine speeds below 3,000 rpm. As did its predecessor, the smooth-runnnig 3.6-liter V-6 is proliferating across the FCA US lineup, launching most recently in the acclaimed 2017 Chrysler Pacifica minivan, after bowing in the 2016 Dodge Durango and Jeep Grand Cherokee, the most-awarded SUV of all time.

The Pentastar family now powers more than five million vehicles in 17 total products across across 11 segments – from muscle coupe to full-size commercial van. Since the debut of its first iteration, the Pentastar family has replaced seven different engines and delivered a 7% improvement in fuel economy across the fleet.

The Pentastar V-6 has a flexible architecture, an attribute that helped it earn a place among Wards 10 Best Engines on three occasions. With little or no modification, it accommodates longitudinal and transverse orientations; front-wheel, rear-wheel, all-wheel and four-wheel-drive systems; 6-speed manual transmissions and 6-, 8- and 9-speed automatic transmissions. This “plug-and-play” capability also affords ready technology enhancement. The Pentastar V-6 is engineered to work with FCA’s MultiAir valve actuation, direct injection and turbocharging.​

2016 3.6-liter Pentastar Upgrade

Key features of 3.6-liter Pentastar V-6, upgraded in 2016.



Innovation Evolution

FCA US LLC leads the industry in the introduction of r-1234yf – a new refrigerant that dramatically reduces greenhouse-gas emissions. Its Global Warming Potential factor is four, compared with 1,430 for the most commonly used refrigerant. FCA US introduced it in the 2014 Jeep Cherokee. Today, it is used in 20 FCA US models.

Innovation Evolution

Cylinder-deactivation in the Ferrari-derived 505-horsepower V-6 bi-turbo engine that propels the 2017 Alfra Romeo Giulia Quadrifoglio – the most powerful Alfa roduction car ever – reduces real-world fuel consumption by up to 15 percent. When running on all six cylinders, the car goes from 0-60 miles per hour (mph) in 3.8 seconds, with a top speed of 191 mph.

Innovation Evolution

The 707-horsepower supercharged 6.2-liter HEMI® Hellcat V-8 is a story of extremes. Its eight injectors are served by half-inch fuel lines, each capable of delivering a flow rate of 600 cc/min. This means the engine can drain the fuel tank dry after 13 minutes at full power. Meanwhile, it earns a mannerly EPA highway fuel-economy rating of 22 mpg – nearly double that of some six-figure supercars with less horsepower.

Transmissions and Drivelines  

The FCA US transmission portfolio ranges from robust, race-inspired manual transmissions, to refined, highly precise automatic transmissions that changed the industry. These offerings are designed to meet market demands in the different regions where we operate, and to deliver the performance characteristics that are consistent with brand identities. 

FCA US is an established leader in automatic transmission technology, offering eight- and nine-speed gearboxes that deliver peak efficiency, satisfying performance and superior refinement. These advanced-technology transmissions contribute to fuel-economy gains of 6-10% compared with their four-, five- and six-speed predecessors. Particular focus is placed onoptimizing engine-transmission pairings, determinations made with the help of state-of-the-art simulation software . The core objective is to develop the most efficient powertrain solutions for each vehicle, in everysegment, to significantly reduce fuel consumption and CO2 emissions. 

The new Jeep Compass joins the Jeep Renegade as the first vehicles in their segments to feature nine-speed automatic transmissions. The innovative gearbox, also available on the Fiat 500X, delivers a smooth driving experience.  These vehicles also benefir from proprietary FCA US all-wheel four-wheel drive systems that disconnect the vehicles’ rear axles when driving conditions warrant only front-wheel drive. The technology improves efficiency by reducing the number of rotating components in the driveline. Moving parts that do not contribute to propulsion contribute to an inefficiency known as spin loss. FCA US employs similar technology on rear-wheel-drive vehicles such as the new Dodge Challenger GT. Its driveline disconnects from the front axle when all-wheel-drive would be superflulous.

Meanwhile, the highly efficient TorqueFlite eight-speed automatic transmission is now powering more than one million vehicles, with availability on 10 FCA US models ranging from the Alfa Romeo Giulia, to the Jeep Grand Cherokee SRT.  FCA US engineers calculate the initial population of vehicles equipped with the TorqueFlite eight-speed will save customers more than 700 million gallons of fuel while reducing C02 emissions by more than six million metric tonnes, compared with the same vehicles equipped with more conventional gearboxes. 


Alternative Proplusion 


Alternative propulsion is a fundamental contributor to the FCA US emissions-reduction strategy.  



FCA US is committed to the development of electrified propulsion technologies that reduce our environmental footprint while delivering affordable value for our customers. Our research activities have extended from the development of conventional mild-hybrid propulsion systems, to field-testing the first factory-built, plug-in hybrid pickups capable of linking together to form their own power grid.

In the U.S., the all-new 2017 Chrysler Pacifica Hybrid, the industry’s first electrified minivan, delivers an estimated range of 33 miles solely on zero-emissions electric power from a 16-kWh lithium-ion (Li-ion) battery. It also earned a rating of 84 miles per gallon equivalent (MPGe) from the U.S. Environmental Protection Agency.

When the battery’s energy is depleted beyond a certain threshold, the Pacifica Hybrid becomes a part-time electric vehicle, like a conventional hybrid. Power to the wheels is supplied by the electric drive system or supplemented by a specially adapted new version of the award-winning FCA US Pentastar 3.6-liter V-6 engine. It was named one of Wards 10 Best Engines for 2017.

The pivotal technology behind the all-new Chrysler Pacifica Hybrid is its innovative eFlite electrically variable transmission (EVT). Designed by FCA US, the device features two electric motors – both of which are capable of driving the vehicle’s wheels. 

Note: Not all features and technologies indicated are available in all markets, or on all versions of a given vehicle. Check the company or brand website for information about features available in your area.​​​​​​​​



About FCA US

Learn about FCA US LLC, a North American automaker with a new name and a long history.


The Brands

Learn how the Alfa Romeo, Chrysler, Dodge, FIAT, Jeep, Ram and Mopar brands are setting the pace for design and performance.


Commitment to Safety

Learn how the FCA US is committed to helping keep drivers and passengers safe.