Speed limit compliance could save $26 million in fuel daily

A new national study finds that if U.S. drivers adhered to posted speed limits, it could collectively save millions of dollars in fuel costs and prevent tens of thousands of metric tons of carbon dioxide emissions daily, while adding less than a minute to the average commute. The research, published on July 16, 2026, in the journal Communications Sustainability, analyzed over 120 million real-world vehicle trips across the United States.

Researchers from the University of Minnesota used a massive dataset tracking vehicle locations and speeds every three seconds on four separate days in 2021. They mapped this data against speed limits and road networks. The analysis found that more than 43% of the studied trips included at least one instance of speeding, with drivers spending nearly 12% of their driving time exceeding the limit.

The study concluded that if drivers of conventional, light-duty vehicles drove at or below posted speed limits, it could save an average of 22 million dollars and 6.7 million gallons of fuel daily, based on 2021 fuel prices. This action would also prevent approximately 57,000 metric tonnes of carbon dioxide emissions each day, an amount comparable to...