An Eco Illumination2 light turns from red to green as driving efficiency increases and provides an awareness of driving habits.

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Mr. DAVID FRIEDMAN (Union of Concerned Scientists): There it is, right above the tachometer, a nice green eco-light that tells me I'm getting better fuel economy because I'm only operating on half the cylinders.

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Independent analysts have stated that it is best suited for eco-tourism and light traffic.

ECONOMIST: Letters | The