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Neil -
There is a circumstance where you can claim they save fuel. I use them to protect the battery when I turn the engine off at long stoplights at night.
If I know the stoplight will be long, I will sometimes turn off the engine but leave the *running* lights on for safety. That way someone pulling in behind me won't approach a dark car stopped at the intersection. I am "safety-minded" and I get to turn off my engine. Everybody wins!
CarloSW2
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