How to Improve the Mileage of an Chevrolet Cars

by Contributing Writer; Updated June 12, 2017

A Chevrolet car is a large sports utility vehicle that owners typically enjoy for its durability and size features. The heavy structure, roomy interior and storage capabilities, however, create a greater load for the motor to carry. The harder your motor is working to support your driving style, vehicle weight and engine condition, the more fuel that is required to keep everything running efficiently. Luckily, there are several easy ways to reduce the number of trips to the gas station and improve the fuel mileage on your Chevrolet car.

Under The Hood:

 How to Improve the Mileage of an 8.1-Liter Chevy Engine

Perform regular maintenance on your Chevrolet 8.1-liter motor. A badly running motor will consume more fuel than a properly maintained engine. Perform regularly scheduled repairs, tune-ups and oil changes.

Limit the amount of weight your truck carries. The more the truck and its cargo weigh, the more fuel the 8.1-liter engine will use to transport it. Make sure to keep loads you are towing as light as possible, and do not use large trailers for smaller loads. Do not transport heavy items unnecessarily. It is not unheard of to remove the tailgate from the truck and replace it with a vinyl or fabric tailgate designed to save fuel mileage.

Put low-rolling-resistance tires on the truck or sport-utility vehicle. These tires are designed to improve fuel mileage by reducing the amount of work your vehicle has to do to power the vehicle. The Union of Concerned Scientists estimates that these tires can improve fuel economy by up to 2 percent.

Avoid using the air conditioner as much as possible. Running your air conditioner at lower speeds makes more work for your 8.1-liter engine and causes it to use more fuel. Roll down your windows to keep the inside of your truck cool.

Do not leave your 8.1-liter engine idling for more than a couple of minutes. Idling is a big waste of fuel and it produces emissions that can harm the environment. Turn your truck or sport-utility vehicle off if you plan on sitting in one location for any length of time.

 How to Improve the Fuel Mileage on an Avalanche

Use a tonneau cover. As with any pick-up truck, purchasing a tonneau cover is a fuel-saving investment. While you may feel like your Avalanche drives fine without one, the difference in your mpg average will be tremendous. The wind resistance that occurs in the bed of the truck is known as "drag." Such aerodynamics create a force that works against your vehicle, causing your engine to perform under stressful conditions. When your engine is stressed, your gas tank is depleted.

Eliminate excess baggage. Take a look in the bed and back seat of your truck and determine what you really need to be lugging around on a day to day basis. Pick-up truck owners tend to use their truck as a storage space on wheels; however, the impact that heavier weight carries on your fuel tank may create greater frustration than the convenience of storage is worth.

Ease up on the gas pedal. The forcefulness of heavy acceleration creates a thrust of gas to make the engine work hard, quickly. As you leave stop signs and lights, accelerate gradually to build up to your desired speed. When you reach that speed, allow your truck to coast. The heavy weight of an Avalanche may tempt you to press harder to achieve your goals in a minimum amount of time, but with such forcefulness, you are likely to be accelerating all the way to the nearest gas station instead.

Reconsider the method you use to cool your vehicle. Whether or not to roll down your windows or turn the air-conditioning on is a very debatable topic. Since the aerodynamic pull created by open windows impacts your fuel mileage as much as turning up the a/c, a sensible compromise may be to keep the air-conditioning on low or only crack the windows for a cooling effect.

Check the air pressure in your tires on a routine basis. Tires that are low, weak or leaky cannot hold your Avalanche's heavy weight alone. The slack that bad tires creates will be made up for by the motor. Since the motor will be working harder for each part to operate, it will require more fuel and you will receive less mpg. Fully inflated tires have the important purpose of holding the vehicle's weight, therefore allowing the engine to do its job with minimal strain.

 How to Increase Gas Mileage on a Chevy 454 Eng

Replace your current air filter with a high-flow dry or oiled air filter. Several manufacturers offer lifetime, high-flow air filters, which are available at any auto parts store. Simply remove your existing one by unscrewing the hold-down bolts and install the new one directly onto the engine.

Remove your spark plugs using a spark plug socket wrench. Install platinum quad-head or iridium spark plugs also available at any auto parts store. Disconnect the spark plug wire and replace each spark plug one at a time so as to not confuse the location of the wires. Reattach the spark plug wire before changing out the next plug.

Adjust your idle speed to the lowest setting. The idle screw is located on the side of the carburetor connected to the throttle cable. Adjust the screw with a Phillips-head screwdriver while the vehicle is running and warm. You want the idle to be around 800 to 900 rpm with the vehicle in park and around 700 rpm with the vehicle in neutral. Monitor your tachometer while adjusting. Adjust the idle by sound if you do not have a tachometer. Listen for the engine rpm to drop until just before it starts to sputter. You want the sound to be smooth without coughing or sputtering.

Tune up your vehicle. Dirty or poorly timed carburetors do not properly mix the fuel and air. A simple cleaning by spraying a carburetor cleaner into the open ports of the carburetor with the air filter removed and the vehicle running cleans the carburetors for increased performance and mileage. Routine maintenance and maintaining a low idle speed also increases performance and mileage.

Maintain the proper tire pressure in your vehicle. Check the pressure and ensure that it is at factory specifications. Lower tire pressure creates higher drag that forces more fuel to be consumed. Check the tire pressure weekly.

Items you will need

  • Air filter

  • Platinum or iridium spark plugs

  • Spark plug socket wrench

  • Phillips-head screwdriver

  • Carburetor cleaner

 How to Improve Gas Mileage in a Chevrolet Blazer

Use your four-wheel drive and air conditioner only when necessary. Both four-wheel drive and air conditioning decrease your gas mileage by drawing power from your engine. The engine compensates by burning more fuel.

Replace your original equipment with a performance-enhanced exhaust system. These systems have wider and straighter pipes that improve exhaust flow. Better exhaust flow results in improved gas mileage.

Place an upgraded air filter in your Blazer. These air filters cost about twice as much as a regular air filter, but they are designed to last the lifetime of the car. They also improve gas mileage because they don't become nearly as clogged.

Purchase new tires that have radial designs that improve gas mileage by reducing rolling resistance. Check the tires or the tire manufacturer's specifications for the correct tire pressure. Check your tires on a consistent basis to make sure they have the correct pressure.

Install a new and improved air intake kit to replace your old air box and filter. These kits allow air to flow into the engine faster and provide better gas mileage than stock air boxes.

Tune up your Chevy Blazer and have the oil changed when required. A Chevy Blazer should be tuned up every 60,000 to 100,000 miles, depending on the age of the vehicle. Older Blazers need to be tuned up more often. A Chevy Blazer should have its oil changed every 3,000 miles.

Remove as much weight as you can from your Blazer. Don't carry around unnecessary items. Only use luggage and bike racks when necessary.

Improve your driving habits. Obey the speed limits. Don't rev up the engine. Avoid sudden starts and stops. Use a GPS system so you do not get lost. Combine your errands to reduce mileage on your Blazer. Avoid driving during rush hour, if practical.

Items you will need

  • Exhaust system

  • Air filter

  • Tires

  • Air intake kit

  • GPS system

 How do I Improve the Gas Mileage on a 1500HD 4X4 6.0L?

Drive smart. Avoid quick "jackrabbit" starts. Both trucks weigh more than 8,600 pounds. Rapid acceleration will only make the engine work harder. According to the Federal Trade Commission, you can improve your gas mileage up to five percent by simply stopping aggressive driving.

Attend to routine maintenance as little things add up. Check your oil and fuel filters. Change your oil as needed. Dirty oil causes a drop in engine and fuel efficiency. Use synthetic oil in your truck. Synthetic lubricants cause less friction. Make sure you are using the proper coolant. Don't forget to change your air filter. Check and replace spark plugs as needed. Tune-ups keep your truck running efficiently. The FTC claims that a well-tuned engine can improve fuel mileage an average of four percent.

Check the air pressure in your tires and make sure they are properly inflated. Under-inflated tires can cause rolling resistance. According to the Department of Energy, properly inflated tires can improve your fuel economy by 3.3 percent. Check your tires monthly.

Pump properly. The Silverado and Sierra both require only regular unleaded gas (87 octane). Higher grades just cost more, and will not increase performance.

Watch your weight. Clear out heavy objects and tools from the truck bed when you don't need them. According to the FTC, an extra 100 pounds can reduce fuel economy by up to two percent. After-market accessories can add additional weight, which can affect fuel economy. Many drivers love to equip their trucks with large off-road tires and roll bars. These accessories can be useful, but if they are just for looks, then they're adding unnecessary rolling resistance, weight and aerodynamic drag.

 How to Improve the Gas Mileage in a Silverado

Use the recommended grade of motor oil. According to the U.S. Department of Energy and the U.S. Environmental Protection Agency, using the recommended weight of motor oil can increase fuel economy up to 2 percent.

Keep the tires inflated to the proper air pressure; tires that have too much or too little air pressure will result in decreased fuel economy. The appropriate air pressure depends on the type and size of tires you have on your Silverado. Consult your tire manufacturer to determine the proper level of air pressure.

Take your Silverado in for a tune-up and perform all recommended service at the mileage recommended in your owner's manual. A properly maintained engine burns less gas than a dirty or improperly tuned engine.

Accelerate at a slower rate. Mashing on the gas pedal causes your engine to burn fuel at a faster rate, resulting in less fuel efficiency.

Adhere to all posted speed limits. According to, gas mileage decreases significantly at speeds over 60 mph.

Remove excess items from the bed of your Silverado. Heavier cars use more gas, because the engine must work harder.

Turn off your engine instead of idling for long periods of time. When you idle, the engine is burning gas, even though you're not going anywhere.

 How to Improve Gas Mileage in a Cavalier

Install an upgraded and performance-enhanced exhaust system to replace stock equipment. These new systems improve the exhaust flow with pipes that are wider and straighter. Improved exhaust improves gas mileage in a car.

Install an upgraded air filter. These air filters improve gas mileage and are designed to last for the lifetime of the car. They are available at auto parts stores and online. They generally are twice as expensive as a standard air filter, usually in the $40 range, but well worth it when you consider most air filters need to be replaced once a year. The frequency with which you replace a standard air filter depends on how many miles you drive and the condition of your car.

Install a new and improved air intake kit to replace your old air box and filter. These kits allow air to flow into the engine faster than stock air boxes, which also improves your gas mileage.

Buy new tires that have radial designs for improved gas mileage by reducing rolling resistance. Rolling resistance is also reduced by placing larger diameter tires on the rear wheels. Check the tire manufacturer's specifications for maximum tire pressure. Check to make sure your tires have the correct pressure at all times.

Tune up your Chevy Cavalier as needed. Tell your mechanic to look for fouled fuel injectors and to check the spark plugs. A Chevy Cavalier should be tuned up every 60,000 to 100,000 miles, depending on the age of the car. Older cars need to be tuned up more often.

Take your Chevy Cavalier to a mechanic for a brake inspection. Brakes that bind or stick lower gas mileage.

Ensure that the oil is clean and have it changed according to the mileage instructions in the Cavalier's owner's manual. Cavaliers should have an oil change every 3,000 miles.

Use the level of fuel octane recommended in the owner's manual. Chevrolet Cavaliers operate well on regular unleaded fuel (87 octane) when they are tuned up and running properly.

 How to Improve Gas Mileage in a 1995 Chevy Silverado

Remain at speeds below 60 miles per hour when driving your Chevy Silverado. Obviously, your truck is not built for racing or darting through traffic at 80 mph. Rather, it’s constructed for low-end power, which is necessary for hauling and towing. Thus, at speeds beyond 60 mph, your engine runs at very high RPMs. This, in turn, is a massive drag on fuel economy.

Use your Silverado’s overdrive and cruise control when traveling on the highway. It’s best to use overdrive when driving in light traffic on flat terrain.

Drive your Chevy Silverado with fuel economy on your mind. This simply means that you must drive with caution and calm. Practice slowly starting out from a dead stop, pressing on the accelerator gradually. Do the same when stopping; applying your brakes softly. If you drive calmly and make the conscious decision to save gas, you will see savings at the pump.

Make your 1995 Chevy Silverado as light as possible. A heavy truck doesn’t need to be any heavier. An extra 100 pounds is capable of decreasing your truck’s fuel economy by as much as 2 percent. Therefore, don’t haul cargo more than necessary. Also, if you’ve personalized the truck with accessories such as extra chrome, large tires, step bars, toolboxes or heavy wheels, consider removing them for the sake of fuel efficiency.

Turn your Silverado’s engine off rather than allow it to idle. Do not start your truck in the morning simply to allow it to warm up. When parked for more than a few minutes, you’ll save gas by turning the engine and then restarting it when you’re ready to go.

Set up a maintenance schedule for your ‘95 Silverado. Just like people, as your truck grows older, it needs more care. A yearly trip to the mechanic will keep your engine and transmission operating smoothly. This will result in better gas mileage. Change your oil about every 3,000 miles and check to make sure your Silverado’s tires are inflated to the level printed on the sidewalls.

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