The Average Car Now Weighs 4,354 Pounds - And That’s a Bigger Deal Than You Think

Every new model seems to arrive with more stuff: extra airbags, thicker sound insulation, bigger screens, and in many cases, an electric motor and a heavy battery pack. Safety regulations have forced automakers to reinforce frames and add more restraint systems, while buyers expect powered seats, giant infotainment displays, and all the other creature comforts.

None of it is weightless. S. now tips the scales at 4,354 pounds. That’s nearly 300 pounds heavier than the 1975 average of 4,060 pounds, and the last two model years have been the heaviest on record. Preliminary data for 2025 suggests the number is still climbing, to 4,441 pounds.

All that extra mass comes with real consequences. D. Power data shows that for every 1,000-pound reduction in vehicle weight, the fatality rate drops by more than 40 percent. The math works the other way at the pump: shedding 100 pounds improves fuel economy by about 1 to 2 percent.

Heavier cars also need more distance to stop, because brakes have to overcome that extra momentum. Tires wear faster too, the electric BMW i4 eDrive35 weighs 761 pounds more than the gas-powered 430i, and that kind of difference is a major reason EVs chew through tires quicker than their conventional counterparts.

When a vehicle pushes past 4,000 pounds, adding another 500 pounds barely improves safety for the driver, IIHS data shows just one fewer death per million registered vehicle-years, but the people they hit face a risk that’s seven times higher. Trucks are especially dangerous: being struck by one makes your odds of dying nearly 200 percent higher than being hit by a car.

Weight also kills performance, even when automakers throw more horsepower at the problem. 2 pounds per horsepower. 9 pounds per horsepower, and it beats the BMW to 60 mph by two-tenths of a second. The latest BMW M5 is a case study in what happens when weight gets out of hand. The new G90 M5 weighs roughly 1,190 pounds more than the previous F90 M5 Competition, a 28 percent jump.

1. More weight doesn’t just cost you at the gas station; it costs you at the stoplight.