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Even though Scania has recently switched its focus from compression-ignition ethanol engines to spark-ignition NG engines, mostly with CNG which is readily available in more regions than LNG, most of the long-haul trucks I have seen with a CNG fuel system in my country relied on it as a supplemental injection and retained the ability to run on Diesel fuel. The last time I remember seeing a dedicated-CNG truck, it was an Iveco in 2014.
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