I have an 06 Polo GTI which I have had for 3 years and it has done 69,000 kms. About 1.5 years ago I got a trial tune which lasted for 6 hours of driving time so I could decide if I wanted to buy the tune or not. I didn't. Since then the car has been running at about 12L/100km which is quite high. Although I do use the A/C when driving but I am not sinking the boot in at all. How much would it cost for VW to do a re-set of my computer or is it worth just taking it to my mechanic (if he can re-flash the computer)? or is there any other suggestions? Thanks.