One word...
ok, i lied. heres a lot of them
70 miles per gallon, a 7-speed direct shift gearbox (DSG) with a twin-clutch, minor modifications to reduce aerodynamic drag, CO2 emissions of 89 g/km (lower than a Toyota Prius hybrid), and Tier 2 Bin 5 tailpipe emissions. And of course, the ability to run on biodiesel (waste cooking oil or even algae).
But it was too good to be true. VW contradicted its earlier statement in the March 27 issue of Auto, Motor und Sport and said that the Golf turbo-diesel hybrid would be too expensive, so they're not going to make it. (A diesel that is)
R.I.P. Golf Turbo-Diesel Hybrid. We hardly knew ya.
Revealed: Volkswagen’s 69.9-MPG Diesel Hybrid | Autopia | Wired.com