I've driven the 991 pdk and previously owned a 2011 PTT. In my opinion, the PDK has better 'logic' about when to shift - as if it's psychic. Obviously, this is when driven in 'auto mode'. However, when driven in manual mode the DCT has faster shift times and is a better overall product (JMHO).
On a recent long drive I averaged 26.5mpg while on level ground - I was at sea level and was on cruise at 75mph. Once I went inland the mpg suffered a bit and I'd say that the average was around 22-24mpg depending on speed, etc.
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