Funny thing that, i have very similar problems with mine, power is fine - the turbo is a little sudden though! but problems at idle, stalls when you use the clutch at junctions/traffic lights/any other reson you stop and uses a fair amount of petrol. i also have a strong smell of fuel around the car when i fill 'er right up! as for fuel consumption, she on her way to st ives this weekend so i am going to check it while i am down there (long motorway drive down then some back road fun!) - i know this is no help to you by the way, but at least your not the only one! (mine is a t16s)