Ummm... yes they are turning the engine off. The engine is off - not turning at all. Honda's hybrids do it. Toyota's hybrids do it. Ford's hybrids do it. GM's hybrids do it. As mentioned above, other makers, like your own BMW, are also designing systems to do the same.
UPS has a policy for their drivers to shut down any time they're stopped for deliveries. You can be sure they studied it in detail and found it worthwhile.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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