In 1986, an ?e? on the rump of a BMW 3-series denoted the slowest, most fuel-efficient version on sale. From 1984 through 1987, the North American 325e packed a 2.7-liter inline-six with a diesel-like 4700-rpm redline. The ?e? stood for ?eta,? the Greek letter associated with efficiency, and the model?s formula of high torque, lazy revs, and a tal...
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