Cars Q&A

I have LINEA DYNAMIC DIESEL that has done almost 8500 kms (first service still due). For the last 2 months I have observed that there is sudden drop in its consumption from 17.5 to 12.2 km / L. I got is checked from AUTHORIZED TATA-FIAT service center, they did some computerized adjustment, but still that has not improved. Please advise whom to contact & what could be the possible reason for this. I am based in lucknow & there are 3 TATA-FIAT DEALERS but don't know which one is having geniunely FIAT trained engineers as all these are having TATA CARS mechanics with no clear-cut separate departments. If you can provide me number / e-mail of FIAT country head - service manager, it will of great help. Thanking you DR. R. V. TRIVEDI