To read a car tire pressure gauge, first ensure the tires are cool (not driven for three hours prior). Locate the gauge on the dashboard or in the glove compartment. Insert the gauge into the valve stem, press until resistance is felt, and note the reading in pounds per square inch (PSI). Compare this value to the manufacturer’s recommended pressure, typically listed on the driver’s door jamb or in the owner’s manual. Adjust using a tire inflator or deflator if necessary. Always check all four tires, including the spare, and maintain the recommended pressure for optimal safety, handling, and fuel efficiency.

Regular tire pressure monitoring is critical because under-inflation reduces fuel efficiency by up to 3% and increases rolling resistance, costing drivers an average of $100 annually in extra fuel consumption (U.S. Department of Energy, 2021). Over-inflation, conversely, compromises tire grip, leading to uneven wear and higher risks of blowouts, particularly at high speeds. A 2020 National Highway Traffic Safety Administration (NHTSA) study found that 32% of tire-related crashes involved under-inflated tires, contributing to 660 fatalities that year. Additionally, proper pressure improves vehicle stability, reducing the likelihood of skidding or loss of control during sudden maneuvers. The American Academy of Pediatrics emphasizes that maintaining correct tire pressure is a simple, cost-effective step to prevent accidents and protect passengers. Automakers like Toyota and Ford now integrate tire pressure monitoring systems (TPMS) into vehicles, but manual checks remain essential for accuracy, as TPMS sensors can fail or require recalibration. Ultimately, adhering to recommended PSI standards enhances safety, extends tire lifespan by 30%, and supports environmental goals through reduced emissions.