It looks like they added a few items to their website recently unless I missed this.
They have several calculators which give the savings and payback period. The device costs $2025 which is why they are targeting fleets. At that price it is not economical for a normal passenger car. I would bet their R&D is targeted to get the cost down as well as improve the device.
They also have more info about emissions and diesel problems. In Europe emissions are tighter.
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