On the heels of the EPA's news that the average fuel-economy of light-duty new vehicles continues to climb , the agency announced that Mazda is leading the charge. It named the Japanese company the most fuel-efficient automaker, with the highest fleetwide adjusted fuel economy of 27.1 mpg for model-year 2012 new vehicles; model-year 2013 figures haven't been finalized yet.
At the low end are GM and Chrysler, but that's hardly surprising. Mazda's car-heavy lineup features four-cylinder engines; only the CX-9 crossover uses a V-6. GM and Chrysler, by comparison, offer a full suite of V-6 and V-8 trucks and SUVs, lowering their average to 21.7 and 20.1 mpg, respectively.
In second place is Honda with a fleetwide average of 26.6 mpg, followed closely by Toyota at 25.6. What's more impressive is Subaru's ranking of 25.2, notable considering the automaker's across-the-board all-wheel-drive lineup.
Click here for CNBC's chart to see how other automakers ranked.