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What On a 85 380Se mercedes what is the economy gauge should it be in the red or white area?

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The old "economy" gauges were little more than an engine vacuum gauge. The assumption was that if you didn't put your foot into the throttle you'd get better economy. Engine vacuum is maximum at an idle or coasting in gear down a hill. The goal of the vacuum gauge was to help you maintain as much engine vacuum as possible, in the hopes that you'd get better economy that way.

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