Remapping 2003 W211 320 CDI

[JohnCL]

Has anyone any views on remapping the above. It's done 122k miles. I'm thinking of getting better mpg for towing a hillclimb kit car.

If the claims are true it should pay for itself + being better to drive.

It would be with an established firm, either Viezu or Superchips. Not a plug in.

Thanks