How To Save Gas with a Hemi

The hemi engine in your car is actually one of the greatest reasons for its better performance and strength. Because the combustion chambers are of hemispherical (half-sphere or bowl-shaped) form, the hemi engine can drive with greater horsepower. The shape of the combustion chamber in a hemi engine allows both air and fuel to flow more easily. The characteristic shape of the chamber also makes complete combustion possible, especially if the spark plug is situated at or near the center of the chamber.

By design, many hemi engines—especially those produced by Chrysler—employ the Multiple Displacement System (MDS). It is the technology that enables the hemi engine to use fewer cylinders for situations that do not really necessitate the use of all available cylinders. When the car’s sensors detect that there is no need for all eight cylinders, the Multiple Displacement System almost instantly—at about 40 milliseconds—shuts off all fuel and air supply to half of the engine’s cylinders. This technology makes the hemi relatively economical in terms of fuel consumption.

Yet, despite the energy-saving design of a hemi engine, it is still possible to save more gas. This article describes some tips that can help you save gas with a hemi.

  1. Tell the MDS to shut down half of the total cylinders. There is no remote control for this one. The MDS automatically does this, but you will have to let it know that you don’t need the extra horsepower. How?  By simply limiting your speed to no more than 65 miles per hour. Once the vehicle detects your speed, it will automatically—and you will hardly know it—deactivate the other four cylinders; thus, you will burn less fuel for the speed you’re at. Maintain a steady velocity so that you won’t activate the other cylinders unnecessarily. You can do this much better if you use cruise control, if your car has one.
  2. Avoid sudden acceleration. This means that you step on the gas pedal slowly and smoothly—not suddenly—or else you will be merely pumping more gas unnecessarily into the engine and activate—unnecessarily so—all engine cylinders. If your acceleration is gradual, your hemi engine will use only four cylinders and less fuel until you reach a velocity that will justify activation of more cylinders for more power.
  3. Inflate your tires with nitrogen. Instead of using ordinary air, pump up your tires with nitrogen, which not only provides a more stable pressure but also lengthens your tire’s life. Stable tire pressure translates to better road performance and better fuel efficiency.
  4. Perform regular maintenance checkups. This is a basic requirement for all car owners, not just for those who own a hemi. Regular maintenance of your car keeps your car in top shape and condition.
  5. Replace your car’s air intake and exhaust system. Although this is optional, installing a wider air intake and exhaust pipe will help improve performance and efficiency, and will also give you more mileage for your gas.

Your hemi engine should be able to give you the power to balance fuel consumption with horsepower requirements, but you could easily waste gas by being ignorant. Now that you are aware of some ways to save further on gas with a hemi, you should be able to extend your mileage with the same amount of gas.


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