According to the annual “Fuel Economy Trends” report issued by the Environmental Protection Agency, Mazda’s cars are the most fuel efficient and least pollutant in America. This is an especially impressive feat, given that Mazda doesn’t presently have any hybrid or electric vehicles in their lineup.

And this isn’t the first year they’ve claimed this title. In 2014, Mazda’s adjusted fuel economy was the best of any automaker at 29.4 miles per gallon (MPG). And they’ve improved that number year over year by another 1.3 MPG, second only to BMW who improved their year over year figures by 1.9 MPG. The country’s overall fuel economy, however, stagnated year over year.

Although the numbers for 2015 are only preliminary at this point, Mazda is expected to retain their number one ranking when the figures are finalized. In fact, they’re expected to average a groundbreaking 30.1 MPG for the year, which would make them the first manufacturer to break the 30 MPG threshold. And that’s not the only area in which the company reigns supreme. In 2014, Mazda’s cars averaged 302 grams per mile in CO2 emissions, already an industry-leading figure, and it’s anticipated that they’ll improve this number by another 6 grams per mile in 2015.

On the other hand, the vehicles from Detroit’s Big Three automakers (Ford, GM and Fiat Chrysler) ranked as the worst on fuel economy, with their popular pickup trucks dragging down the manufacturers’ averages. It is important to remember, however, that these numbers are a snapshot of where the companies were a year ago, and don’t capture their current and future efforts to improve. And with many automakers now devoting more resources to alternative fuel technologies, including Ford’s $4.5 billion investment in electric vehicles over the next five years, it will be interesting to see what the “Fuel Economy Trends” report reveals in a year’s time.

Source: Autoblog