A word of caution.

If tuning box's/chips or whatever you like to call them are fitted and you don't let your insurance company know, they will not pay out in the event of an accident.

Apparently the insurance companies can now plug in a computer to your vehicles ECU and tell from the readings if any aftermarket device is or has ever been fitted.

I have a 2005 diesel and the computer states I'm getting under 19mpg. Are the on board counters accurate ?

not always mate. however depending on how you drive that sort of MPG would be achievable in a TD6. I drive pretty steady and average about 22-23mpg. If I were to give it some beans I am sure that would drop below 20. FFRR TD6 HSE
Adriatic Blue with Parchment leather.

Mojo wrote:

I have a 2005 diesel and the computer states I'm getting under 19mpg. Are the on board counters accurate ?

cheers guys!

....It is driving around town......thanks for the feedback

Quick update;
Drove from my place in north of Durham to Redcar in Cleveland the other day, abour 40 miles round trip, a roads and dual carridgeway, zeroed the computer before I set off and got 38.2 mpg for the trip! Averaging around 30 mpg per tank with mixed driving, mostly short journeys. 2003 Vogue TD6 - Adriatic Blue - 2010 Facelift & 2010 20" wheels
1996 90 Tdi soft top gone
2003 HSE TD6 gone
2005 RRS TDV6 HSE gone
2007 Vogue SE TDV8 gone

38 mpg Is it down hill bothe ways  2008 MY Supercharged
Rimini Red / Jet
four zone climate
remote park heater
and no ugly kid windows.
magnus satis quod turpis satis

38mpg is exceptional.
I'm getting 24ish driving steady. Hoping to get autologoc remap next weekend which might give me an extra 2mpg FFRR TD6 HSE
Adriatic Blue with Parchment leather.

I do a general mix of driving and get something in the region of 25 mpg. Out of curiosity I decided to do a test on my TD6 doing a decent run this weekend. Brimmed my tank and drove from north to south Wales and back. Refilled tank on completion. Drive consisted of town, open road, duel carriageway, motorway etc. And included getting stuck in crawling traffic on a couple of occasions. I wasn't booting the car but I wasn't crawling either. Journey down I averaged 50 mph, journey back about 45 (traffic jams etc). I completed 321 miles and used just under 50 litres. I calculated aprox 29.5 mpg. The computer gave 31 mpg.

I am considering getting a remap to assist fuel consumption as I am pretty happy with power. Any thoughts anyone.? No longer FF owner but still interested. Present car Jaguar XE
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Previous car Td6 SE
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Previous LR- Disco 300TDi Auto

Without any box fitted if I drive carefully averaging 55-70 mph along motorways I can get around 40mpg according to the ecu. Could not go faster due to the road widening on the M1 and M25. I think my car might have been remapped in the past.

Just drove from Milton Keynes to Greenwich including stopping for lunch and hitting 45 minutes of solid traffic at the QE2 bridge and averaged 39.6 mpg which did surprise me somewhat. Just had to make sure I was not heavy footed. Tom

Current Drive
2011 4.4 TDV8 Autobiography - Santorini Black - Ivory Leather

Previous Drives
2004 Model Vogue Td6 (Touchscreen) - Java Black - Parchment Leather
1994 RR Classic 3.9 V8 Soft dash - Niagara Grey - Grey Leather
1972 Series III SWB Safari - Green (Hand Painted) - Black Plastic

The fuel computer runs off your "B" trip. To get an accurate reading for a single journey (pre-2010), reset this to ZERO. Post 2010 have a "this trip" setting too which can be quite scary! Land Rover Addict
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Previous
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2009 5.0V8SC Autobiography
2006 4.2V8SC Autobiography
2004 4.4V8 Vogue

Thrasher wrote:

The fuel computer runs off your "B" trip. To get an accurate reading for a single journey (pre-2010), reset this to ZERO. Post 2010 have a "this trip" setting too which can be quite scary!