In using the Active Cruise Control, I notice that the speed is about 4-5 miles per hour different than my speedometer. Has anyone else had this probelm?

I set the cruise at 70 on an open road, and when the truck reaches constant speed, the speedometer indicates 74. Thanks,
BGreig

Yes, I've had this on my TDv6 - set the speed on the cruise and the car setlles at a higher speed but very slowly returns top the set speed, compared to the cuise I had on the Freelander and the TD6 L322 RR the Sport's system is not as impressive at controlling the cars speed. I wondered if it was something to do with me having the TDv6, but you are having it with a petrol engined model.

The wierd thing is waiting for the system to detect the car in front and slow down. Had my foot hovering over the brake the first few times. Still pressing the wrong button to resume sometimes.

Keith 4.4HSE Buckingham Blue
Alpaca Premium Leather, Rhodium
Dynamic Pack, PTI

I don't think this should be anything much to worry about. Speedos are quite inaccurate ways of presenting the car's true speed. As the car travels faster the less accurate the speedo reading will become... this could account for your discrepancy?

Cheers
Steve 

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I contacted Land Rover, and their answer was as you describe. The speedometer is less accurate as speed increases, called "deflection.". The interesting thing is that while they have the capability of providing an instrument that is accurate, they design the speedometer to show less than true speed for "liability purposes" according to the lady in the executive offices with whom I spoke. She cites some standard, which she could not provide the name of, which allows up to 10% error.

BGreig Thanks,
BGreig

Yes, it's the same standard that the police use to not cite you for doing a little over 70mph on a motorway (here in the UK, anyhow) - you'll never get ticketed for being lasered/radared at 73-74mph, but reach towards 80mph and over and then you'll see the blue lights in your rearview mirror.

Cheers
Steve 

2009 Outstanding Contribution Award - Joint Runner Up
2009 'Tech-Head Of The Year' Award - Runner Up

Like it here? Then Donate to RRSPORT!!