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Correct Tire Pressure

Gas Mileage & Tire Pressure - What You Need to Know
How to Improve Gas Mileage and Performance Step 4

How to Improve Gas Mileage and Increase Diesel Fuel EconomyPrevious steps:

1. Performance Air Filter
2. Clean Fuel System
3. Best Synthetic Motor Oil

Keeping your tires properly inflated will improve gas mileage, increase diesel fuel economy, and even make your tires last longer. Here are the critical things you need to know.

  How to Set Your Tire Pressure Correctly:

  1. The correct time to measure your tire pressure. It is crucial to check your tire pressures only when your tires are cold. If you set the pressure when your tires are warm from driving they will be under-inflated as tire pressures naturally increase as your tires get warm from driving. The inflation pressure listed on the tire and on your vehicle is the COLD inflation pressure. Your tires are considered cold when your vehicle has not been driven for three hours, or driven for less than one mile.

    Never reduce the pressures when your tires are warm from driving. If you have to add air when your tires are warm, add 4 pounds to the recommended pressure. Then recheck the cold inflation pressure as soon as possible.

    Dial Tire Pressure Gage
    Dial Tire Gage

    Pencil Tire Pressure Gage

    Pencil Tire Gage

    Digital Tire Pressure Gage
    Digital Tire Pressure Gage

    Tire pressures are also effected by cold temperatures. As the outside temperature decreases, so does the pressure in your tires. If the temperature has dropped by twenty degrees or more since you last checked, you need to readjust the pressure.

  2. You cannot judge by looking. Never try to judge your tire inflation levels by just looking at the tires.

    Tires can be under inflated by as much as 50% and still look OK. Always check them with a tire gage.

    Buy a good tire pressure gage and check them in the morning at least once a month, and always before a long trip or before you carry a heavy load.

  3. Use the right kind of tire pressure gage. Do not rely on a pencil type tire pressure gage for an accurate pressure measurement. They are notoriously unreliable and inaccurate. Gas station tire gages can be just as bad. You can buy an accurate digital or dial tire pressure gage for only a few dollars at an auto parts store. A good tire gage is an essential tool everyone should have in their car.
  4. Read the tire sticker on your vehicle. Your vehicle has a sticker which lists the manufacturer's recommended tire inflation pressures. It is usually located on the edge of the drivers door or door jam, or on the inside of the fuel filler flap. Find it and read it. It is critical to use the correct tire pressure for the load you are carrying for safety and to improve gas mileage. Never set your tire pressures below the recommended values.

    Running too low of a tire pressure for the load in your vehicle can cause sudden tire failure and an accident.
  5. What is your tire's maximum cold inflation pressure? The maximum cold tire inflation pressure for passenger vehicles is listed on the side wall of the tire. Never exceed this value when setting the cold inflation pressure. Most passenger car tires in the United States have a maximum cold inflation pressure of a least 35 PSI (pounds per square inch). High performance tires can be up to 44 PSI, and high load truck tires much higher.

    Truck and RV tires require special attention since these vehicles are much heavier and can carry higher loads. The pressure listed on the side of a truck tire is the minimum pressure required to carry the rated load of the tire. You must set truck tire pressures at or above the minimum pressure to carry your load. Follow your vehicle manufacturers recommendations.
  6. Always check your tires before you carry a lot of people or a heavy load. Most vehicles specify lower tire pressures when lightly loaded. This provides a softer ride and better traction when you are only carrying one or two people, and a light load. Increase your tire pressures to the maximum recommended values any time that you carry a full load of people or cargo. This will improve your gas mileage, handling, and safety.


AMSOIL Synthetic Motor Oil, Racing Oil and Diesel Oil Improve Gas Mileage and Increase Horsepower


Injen Cold Air Intake Systems Increase Horsepower, improve gas mileage and diesel fuel economy


WIX Filters are The Number One Filter in NASCAR


NGK Iridium Spark Plugs Increase Horsepower and Fuel Economy


Donaldson Heavy Duty Oil and Air Filters Increase Performance and Reduce Maintenance Costs

How to Improve Gas Mileage and Increase Diesel Fuel EconomyRemaining steps:

5. NGK Spark Plugs & Wires
6. Fuel Efficient Driving
7. Best Synthetic Gear Oil
8. Synthetic Transmission Fluid
9. Auto Repair and Tune Up
10. Free Ways to Improve Gas Mileage

Performance That Saves You Money - MPG Performance ™  

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MPG Performance is dedicated to providing you with the best high performance products that improve gas mileage, increase horsepower, diesel fuel mileage, and reduce maintenance costs for all auto, truck, diesel, SUV, motorcycle, boat, and ATV applications. We have the best synthetic motor oil, heavy duty diesel oil, marine motor oil, synthetic motorcycle oil, 2 stroke and 4 stroke racing oil, transmission fluid, synthetic gear oils, NGK spark plugs & wires, and the most complete line of advanced performance air filters and oil filters, including high performance Injen AMSOIL gasoline and diesel air intake systems. We also show you the best places to get discount high performance auto parts to help you save money.

Our Maximum Fuel Economy section shows you how to get better gas mileage, improve diesel fuel economy, and increase horsepower. We have combined race proven performance products and sound fuel efficiency methods into a complete step-by-step program that includes free gas mileage tips. This fuel saving program also helps the environment. It will reduce your vehicle's exhaust emissions and pollution which can help reduce global warming.

Consult the AMSOIL Online Product Application Guide and your owners manual for service recommendations.
 Your results will vary depending on the mechanical and operating conditions of your vehicle.

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