Hi bigwave, the economy in urban driving is pretty poor to say the least, I haven't checked the figures (not game) If where you live is fairly flat then deactivation will have a chance to work, unlike where I am it's very hilly. With combined city/highway I'm averaging 16l/per100 which I think is fine for what it is. The deactivation comes into it's own on pure highway driving where I'm very impressed with the economy, again I haven't checked the figures but I did the same drive in the nineties in my Pajero 3.0 petrol ( same tank capacity 90l ) and no way it covered that distance on half a tank. If economy is an issue and your doing a lot of city driving forget it! I run mine through my business so it's not really a problem either way. As I mentioned in another post, the enjoyment of driving the beast takes away any fuel pains, it's like a mean mumma in Sport mode that wants to egg you on, so far it's winning the battle.