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Really? There is no denying that running an engine lean can cause problems, while under heavy load. This is due to detonation which can cause serious problems. However, at light loads, detonation is not an issue, and much leaner mixtures can be run.
It is certainly more than just a nifty catch phrase to sell cars.
Look up greasemonkey's thread "Getting the most out of leanburn", he even has a video which shows his air/ fuel ratio gauge go lean as he enters lean burn. A lot of driver's can actually feel the car the enter or leave lean burn while driving. Honda didn't spend extra money on the cars by installing a wideband O2 sensor just to be able to say it's there.
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