(18-10-2012 09:45am)IvorRedOne Wrote:  Well, I use my SD4 Manual on the motorways and stick to 60MPH (Northern Ireland) The A & B Roads where permissible I also drive between 50-60 MPH and I was getting nowhere near what your getting and your driving an Automatic?

(14-10-2012 04:39pm)FujiSan Wrote:  I was neither patronising nor condescending. If however you feel that way then I apologise.

But even so, there seems to be some general agreement that firstly, these sort of units will always be a compromise over the vehicle manufacturers recommended set up, otherwise, as we both have said, LR would do this themselves. So users should be VERY, VERY wary of exactly what those compromises are likely to be.

And secondly, if these units are so very good, why would their manufacturers always seem to advertise them as being easy to remove when you vehicle goes in for a service, and untraceable in use, and invisible to diagnostics units, and many other such phrases? Surely the vehicle manufacturers would to have a problem with them?

My guess is mainly because the nature of the compromises invalidates the manufacturer's warranty on the vehicle. Whether this may be justified or not is irrelevant, it would be LR's prerogative to invalidate the warranty if they thought it justified.

Uninformed owners of new vehicles need to fully understand what they are doing and what the potential consequences may be, which is why I and others are discussing the 'other' aspects of fitting such devices. It's not all positive, there are negatives as well.

I don't doubt for a second that on balance these units will do what they say they will do (except for over inflated MPG claims) my issue is how they do it, and the nature of the compromises that are made.