Hybrids work well in the official fuel tests, but in real life their economy numbers tend to fall flat. So I've just done three tankfuls end-to-end in a Range Rover hybrid, all over Southern England, in pretty well all sorts of driving.
Slightly against my expectations, the powertrain made a case for itself. We've covered mileages here at Top Gear in new Range Rover diesels of the non-hybrid V6 and V8 kind. We tend to get about 27mpg from the V6, and 23-ish from the V8. I got 27.2 (the computer claimed 28.5) out of the hybrid. And the hybrid is pretty well as quick as the V8.