Edit
Mpg i can hit 35-40mpg in town, and over 50mpg on a staedy motorway cruise. Driven like an idiot it only drops to low 20s.
Good gains available from remapping though, all i say is ignore some of the tuners quotes as there are quite a few with farsical quoted gains
Stage 1-circa 200hp
Stage 2 -circa 215hp potential for more if you go for full TBE, IC, Intake etc
Stage 3- circa 230-240hp with hybrid turbo, injectors etc
This is mine with the shark stage 2 map on it