Dedicated Exhaust Gas Recirculation. The test engine (at SwRI) is a four cylinder with the entire exhaust from one cylinder being recirculated to the intake. The EGR generating cylinder is run rich which reforms some of the fuel to H2 and CO. The combination of 25% (cooled) EGR and the reformed fuel products has enabled 14:1 CR, low emissions and 42% BTE from the NA test engine. PSA will implement a turbo version by 2018 - you would expect even higher TE.
http://www.greencarc...r-20130204.html
It is difficult to say whether this technology would benefit an F1 PU. The big question would be - do the benefits carry over to a lean burn environment. (The DEGR system described runs at stoichiometric with 3 way cat.)