You're really only seeing the advertising departments glossy figures of 134 mpg there unsinkable, according to what I've read, the accurate figure in real-world european driving conditions is more like 55 mpg using petrol and electric and when the batteries are flat it'll give around 30mpg . Doesn't seem so good to me for a hi-tech thing that requires specialist support and servicing, unlike my cheap'n'nasty 30 year old Ford Fester 50 odd mpg and Dave at the local garage can fix it easily. If I'm to be stuck in slow moving/stopped traffic that seems to be the average conditions these days, I know that I'd rather do it the cheapest way possible!
Trevor