hello people. 1st post. i hope to post more but probably won't have much time until after the holidays. plus i'm a regular @ vwvortex since my other car is a dub 1.8T. recent owner of hihy 4wd.
i tested a tank of 87 oct last month. i averaged 24.48 mpg in 60/40 city/hwy driving. i drove easier than usual for the test but nothing ridiculous. i'm sure i could get >25 mpg if i really try.

re: reg vs premium
i'm thinking the performance increase (hp) is strictly from the ecu adapting to the higher octance and advancing the timing? or is there something else going on?