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Audi | CNG Europe
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Audi A4 Avant g-tron
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New Generation with CNG Drive: the Audi A3 Sportback 30 g-tron - Audi Club North America
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Audi introduces new CNG A3 Sportback - Green Car Congress
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New Generation with CNG Drive: the Audi A3 Sportback 30 g-tron - Audi Club North America
