[MetroMPG]

Moving the car 10 feet is fine. But, again, realize you will not have power steering or power brakes (if the car has been off for some time) should you need them.

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And the problem with that Popular Mechanics article is that it tries to come up with a hard and fast "rule" on the topic. But the subject is more nuanced than that. Sometimes coasting in gear is better, sometimes coasting in neutral is more efficient. It's further complicated by differences between vehicles. There are lots of threads on the subject - try the search box top left of the page.