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I'm pretty sure UPS fuels it's trucks by natural gas. That or Fedex, but I'm pretty certain one of them does.
Usually it's used by lager corporations that have fleets of trucks that are used locally. This way they can have their own fueling set up at their location.
It is used here in the US and some people do conversions but it's just like electric cars being harder for the average Joe to use them due to not being as practical.
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