Need for speed? Driving above the speed limit costs you — and doesn’t actually save much time

A study found that driving above the speed limit costs drivers money in fuel and increases emissions but saves minimal time. Adhering to posted speed limits could save $22 million daily, 6.7 million gallons of fuel, and 57,000 metric tonnes of CO2 in the U.S., with only a 54-second daily time increase per trip. Researchers analyzed 120 million trips and found 43% of trips included speeding, with significant state-level variations in speeding prevalence.