from experience (APR) and from general forum surfing (REVO) , these 2 provide equivalent or even better MPG from a stg 1 remap.
Often the increased torque means you get to your speed quicker and can use a higher gear.
Obviously the temptation is increased so if you use it fully it will be less.
In terms of stock vs mapped (stg 1) theres NO downside in mpg , in fact it could be better for similar driving.
Only slight issue is that most remaps require 98+ RON (more expensive) v.s
you '
can' run the gti on regular unleaded (but I wouldnt do so)
I ran my ED30 on 98+ for stock anyway , so equiv petrol cost.
a good quality remap for an ED30 is a no brainer tbh (insurance costs aside)