I've been using the i10 1.1 variant for a while now, 100% city drive but I noticed the fuel consumption is high where full tank can only get about 250km. Have sent it to the service centre for a couple of times but still can't trace the root of the problem.

Any suggestions on how to resolve the issue? Heard from some foreman that may need to retune the engine but I'm not too sure about it, is it able to improve fuel consumption? Would also like to know which service centre offers the best service, I normally went to the branch in old klang road.