It was also shown over in this story at greencarcongress yesterday. The picture shows a visual for how they avoid the usual problem of turbo's only operating efficiently in a certain range of exhaust flows. The Tigers system seems to be geared towards recapturing energy from very low exhaust flow and rather than becoming a restriction at higher load and engine speeds, it lets the majority of exhaust gas bypass it entirely. Pretty cool system. At elevated road speeds (perhaps 45-50mph) there would likely be sufficient exhuast flow to efficiently recapture enough waste heat energy from the exhaust to fully charge a hybrid's battery pack with no drag on the engine.

Once the battery pack is at acceptable charge, the Tigers could then divert power towards supplementary propulsion, further reducing the amount of gasoline used even at highway speeds. This has always been one of the weak points for hybrids - the electric assist and battery pack are of little or no use when cruising at 75mph on a flat highway for hours at a time. With the Tigers system, you're recapturing a huge amount of waste energy from the exhaust and can use it to provide a constant 6kw of primary propulsion, in theory, thus improving highway fuel economy greatly.