600-odd miles in, I'm also about to find out the answer to this question.
I took the first 500 miles nice and easy - as I always do with a tight,new engine, keeping it to no more than 3000rpm, and getting there quite gently.
Now we're the other side of 500 miles, I'll occasionally push her up to 4500rpm.
Having tried that a couple of times, I'm beginning to find out where the torque really cuts in - remembering that it's not a diesel of course, which I'm more used to these days - and I have to say, there's definitely some poke there if you go looking.
When we're passed 1000 miles, we'll see what the red line feels like - a place I've not been since my 2.0 litre Honda Accord; there's absolutely no point going red with diesel!
Curiously, the only torque figures I can find for the 1.2 read 75lbft at 3000rpm (I'm more accustomed to 185lbft at 1900rpm) - having been beyond that, it definitely feels like there's more to come.
Economy wise, we're averaging 44.3 over three fills - that will no doubt improve as she loosens up.
Having said that, this is a spreadsheet figure based on fill-up figures - the corresponding computer figure is 49.1, with a high of 55.
I had an acquaintance who's pride and joy was an Alfa 33 that he always drove carefully and slowly.
He took it in for a service which ended up in some major engine surgery to remove a huge mass of oily slime, a major telling-off from the mechanic, and a driving lesson from him that basically hammered his 33 to the red line and beyond.
Mechanic logic - Italian engines are built to rev; anything else will damage them.
My conclusion?
Go as far up the rev range as you feel comfortable with - you'll find your own happy mix of performance and economy, though I don't think there's reason to worry with the 1.2 as it clearly has poke and delivers more to the gallon than my trusty diesel Touran can manage!
