Official Word:

For decades, BMW has made the reduction of emissions and fuel consumption a key part of its product development strategy, just as enhancements to the dynamic ability of each BMW have been a lasting, sustained brand value. BMW's EfficientDynamics engineering philosophy - the pursuit of an enhanced, athletic driving experience while simultaneously lowering the consumption and emissions of each vehicle - resulted in the most dramatic drop in fleet consumption of any automaker from 1990 through...Read.