Fat chance! In Autocar's test, on the motorway at 70-80mph, it averaged 32mpg! They did say they got 60mpg when the battery started off fully charged but they didn't clarify where/how they were driving. What Car said it averaged 39mpg on their 'True MPG' test, whatever that is.
In fact, it is pretty much identical to the Lexus system, except the batteries are obviously much better (or more of them?) as they claim 32 miles on battery alone (Autocar managed 25). The only other difference is that you have more control - you can decide to let the engine only power the batteries and all drive to come from the motors, which would be good for town driving.
So pretty good but 0-60 in 11 secs is a tad dull and all the reviews say it is old-school-diesel noisy and rides badly...
Now, if Lexus could steal their battery design and bring out an RX500... :shruriken: