My guess is the 1.4 TSi engine is not WLTP compliant and as it’s a discontinued engine AFAIK they can’t sale them after the end of this month, at least, that’s how I’ve read the WLTP rules but chances are, there all gone anyway.
Can’t comment on the 1.5 replacement as my 1.5 Touran never materialised and I cancelled it but some say 1.5 + DSG is OK while others have problems so for me it might have been a lucky escape cancelling the Touran, on the other hand being DSG I might have been happy with the engine but overall its a bit of a gamble.
All that said I’m happy going back to diesel because my car has a lot of weight to pull and is, at best of times, three quarters laden and it pulls fully loaded or not without a sniff of a Kangaroo. ?