Re. the aforementioned MPG going from GTD to R. I made that jump in December last year. In the GTD I was mainly doing short journeys where the car was barely warming up, yet I was still getting very high 30s on average, even more if I tried. Doing the same journeys in the R and I'm lucky to get over 20mpg, in fact I quite often see 16 - 17mpg. On a long 140 mile motorway run I struggled to better 32mpg. So I'm spending well over twice as much on fuel.
That's pretty much where I am at, expected to do quite a few long distance hauls to certain offices but one role change later and tend to do short to medium mostly now with 39-43 MPG averages (55 MPG on last 190 mile return trip to Manchester) which is pretty decent and so what you stated does really concern me as your journeys seem similar to mine and 20 MPG could/would soon take the gloss off any satisfaction that maybe getting from performance.
Rarely have change to take the GTD to its limits (which is pretty decent I think) so have toyed with just specifying a new GTD but given reduced mileage the GTI is now nudging ahead of the pack due to the MPG concerns of the R - Saw a brand new out of the box GTI (PP) in Milton Keynes Saturday in CSG and turned my head, a real looker
Could live with early 30's as the average MPG but seems the R would fall pretty short of that when doing the short runs (next town type thing, soon to be pub gardens) that mainly do these days from your comments and more food for though
At present my (today) my 4 cars in order of preference are:
GTI in CSG (PP) (The GTD was the perfect compromise for me, but with reduced mileage the GTI stands clear)
Tiguan - R Line (Need to physically see one, if looks as good in flesh as photos, then may win out)
R (Love everything about the R with Pretoria, and would accept even average MPG, but R goes too far from what understand)
GTD (Perfect Car really, but need to be doing at least 15 k a year for that tag to be true not my now 8-10k)
