Article doesn’t appear to mention what type engine is involved. Is it spark ignition, or diesel/natgas dual injection??
I see this article topic just dealing with building out the fueling stations to a sufficient level with the market starting.
Most of the new truck LNG news I have read recently uses Cummins Westport. The EPA has reduced some of the models available for use in the US, but they still make some other international engines as well.
http://www.cumminswestport.com/technology
The Cummins Westport ISL G and ISX12 G spark ignited natural gas engines use Stoichiometric combustion with cooled gas exhaust recirculation (EGR) and a Three-Way Catalyst (TWC). This technology was developed to meet the stringent 2010 EPA emission requirements and was introduced with the ISL G in June 2007.
The cooled-EGR system takes a measured quantity of exhaust gas and passes it through a cooler to reduce temperatures before mixing it with fuel and the incoming air charge to the cylinder. Stoichiometric combustion in combination with cooled-EGR creates the ideal combustion process with the chemically correct mixing of fuel and air, offering increased power density and thermal efficiency. It also reduces in-cylinder combustion temperatures and creates an oxygen-free exhaust, which then enables the use of a TWC for nitrogen oxide (NOx) control.