I will hold my hands upto the fact compared with alot of you on here I'm no expert by any means. I've never owned a turbo but understand cars enough to plump for a twin air in the near future.
I was just searching for a logical reason the OP's wife doesn't like the twin air. I'm sure driven correctly it's an absolute beauty.
Mikey, For a start it is very noisy (mine is anyway) when moving away and accelerating in first gear. I am going to check under the bonnet just to make sure that the air intake or filter box isn't loose as there is a lot of induction roar.
Secondly, it is quite jerky whilst driving at low speeds round town and before you say it, that is with using the gearbox correctly. I drove it today assuming it was just the wife still thinking she was driving a diesel and letting the car labour, but in this case she was right (for once).
Thirdly, it has a rough tickover (more so when cold) which would normally get the comment, "it sounds like it's running on three cylinders" but obviously it isn't, lol.
However, once warm and in the higher gears it is smooth and relatively quiet and a joy to drive so I'm hoping that when it has some more miles on it the situation will improve somewhat.
babbo, I've only done 170 miles so far so not really much to say regarding MPG but FWIW I've averaged 36.8mpg on the trip computer over that distance, 110 miles of it at between 60 - 75mph and the rest round town. Fuel gauge is reading half full/empty so can't actually give exact figures as I need to brim it again to get those.
In mitigation though it has been in the workshop and had 10 miles road testing and I wouldn't imagine they drove it for economy.
OT. Just out of interest went to try a couple of Abarths today and I was very pleasantly surprised at how strongly they pulled at low revs without any boost showing on the gauge and turbo lag wasn't noticeable either. The wife said that the manual one was smoother to drive than the TwinAir round town and the auto version 500c suited her down to the ground.
If they made an Auto version of the hatchback I'm sure that we would have put an order in for one there and then.