190BHP and getting 600 miles from a tank......That is very impressive!! The torque must be shocking.
Should be around the 300lbs ft mark possibly a little more
I'm getting 540ish out of my A3 with 205bhp and 320lbs ft
On a run fuel economy should improve as the engine is working more efficiently. Your engine needs to be in good health though. Any minor problems will be highlighted by a remap