Fuel-Saving Technology and GMC's Commitment to Continuous Improvement


GMC continues their commitment to offer vehicle owners quality, performance, and fuel saving technology. Professional-grade engineering is behind all the vehicles that GMC produces. Some of this technology may seem complex, but simplified explanations can help vehicle owners in understanding what is behind their vehicle's performance.



While the terms may sound like something geared toward racing, superchargers and turbochargers can enhance fuel economy.


Superchargers are also known as blowers. A supercharger's function is to push air and the air-fuel mixture into the engine cylinders. Regular engine technology uses the down stroke of a piston to pull the air-fuel mixture in to prepare for the compression cycle.


Normal atmospheric pressure is 14.7 pounds per square inch. When an engine is operating at high speed or higher altitudes, normal atmospheric pressure is not enough to maximize the air-fuel mixture that is drawn into the cylinder.


Turbochargers rely on hot gas from the exhaust manifold for power. The system uses the normally wasted heat and energy to compress the intake. This compression increases the density and pressure of the air. The result is more fuel actually burned instead of wasted. This allows the engine to produce more horsepower, a large reason why GMC chose to use a turbocharger for their Duramax Diesel engine.


In short:


  • Superchargers use air compression to force induction and increase power
  • Superchargers boost the pressure of the air at the intake manifold
  • Turbochargers use gas compression to increase air density for increased power
  • Turbochargers are similar in function to superchargers but are exhaust driven



GMC Sierra HD models, the 2500HD, 2500HD Denali, 3500HD, and 3500 HD Denali equipped with a Duramax Diesel, all use both a turbocharger and direct injection to give the power and efficiency truck owners demand. Both passenger and cargo models of the Savana are also available with a Duramax 6.6-liter Turbo V8 diesel engine.



The Sierra XFE is designed to offer maximum fuel efficiency. By focusing on multiple components in this vehicle, GMC is able to provide the horsepower of a truck that achieves 22 mpg on the highway. The XFE incorporates a 5.3-liter V8 engine with Active Fuel Management and FlexFuel ability.


GMC engineers do not just look at the engine; they look at the entire truck to maximize economy while maintaining power and reliability. Fuel-saving technology includes improvements to aerodynamics and chassis tuning, which contribute to the fuel efficiency with no loss in performance.


Sierra's fuel saving technology is more than just a financial benefit. The XFE has a 26-gallon tank that allows the vehicle to travel up to 572 miles before re-fueling. Owners can spend more time doing what they need and less time finding gas stations.