[edoceo]

Down thread it's explained that the device weighs 1000+ lbs more when full, after 600 miles.

600 miles isn't the full tank of combustion. Sound like driver is swapping tanks or something at one of their stops.

[yodelshady]

That makes for about 470 k per km captured, and they're not claiming 100% efficiency. So it passes that sniff test, at least. Weight is also plausible.

Final q (other than cost): how much exhaust backpressure?

[paulgross]

This is a crucial question! To our surprise, our beta testing of our prototype has actually shown that this is creating < 0.5 psi back pressure on the engine (negligible) and we believe we can get it down to essentially 0 by the time we deliver our first units to customers this summer.