Better Fuel efficency (after ECE tune)

[AndrewBurns]

I was driving in super heavy traffic this morning, rarely left 2nd gear so I certainly wasn't accelerating hard or anything, average speed 9 kph and average consumption 18.8 L/100km. On a highway trip where my average is up around 70 kph my consumption gets down around 6L/100km. I've had real average values for a tank (based on amount filled and change in ODO) of between 6.7L/100km and 10L/100km depending on if the majority of that tank was city or highway driving.

[blutopless2]

My fuel economy improved about 1L/100klm driving the same routes in suburban driving. Highway driving it improved by up to 1.5L/100klm. Best result I got was 7.5L/100klms between Melb and Sydney cruising at 110km/h.
This was in a MKV Jetta 6DSG with APR tune to approx 180kW.
Its all about the way you drive it.