Via Gizmodo:

‘If only there were a simple way for drivers of gas-powered cars to cut down their fuel costs while also reducing planet-warming carbon emissions.

A new study says there is. The findings, published Thursday in the journal Communications Sustainability, show that if U.S. drivers of gas-powered passenger vehicles actually drove the speed limit, it could save an average of 6.7 million gallons of gas, 57,000 tons of carbon dioxide (CO2) emissions, and $22 million per day, based on fuel costs during the study period. That’s equivalent to taking about 5.5 million cars off the road, according to the researchers.

While it may feel like speeding shaves a significant amount of time off your commute, the study suggests that driving at or below the speed limit lengthens commute times by just 54 seconds per day, or 6.3 minutes per week, based on the average daily driving distance of 28.6 miles (46.03 kilometers).’