I have just returned from a weekend away and thought I would take the opportunity to check the trip computer accuracy.
I brimmed the tank on Friday. 478 miles back to same garage, trip computer said 34.1mpg.
My calculations using free iPhone app came to 33.8mpg.
Near enough for me and very happy with mpg given it included several motorway jams in roadworks on M5 and M6 plus some nightmare driving in heavy London traffic. Incidentally, when I brimmed it on my return it showed a range of 578miles, which is the highest I have ever seen it read.
It will now take me the rest of the week to clean all the dead flies off.

Cheers

Just found receipt for fuel. It used 63.6 litres . G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

Last edited by Baltic Blue on 21st Jul 2017 9:40am. Edited 1 time in total

Got to be pleased with that!
According to the OBC i get 24 ish from my 07 TDV8 on my daily commute, I'm running general grabber AT's at 36 PSI might have a play with pressures to see if makes any difference 🤔

Blimey, never seen as much as 30 mpg since I got it earlier this year!
My.wife has just driven 380 miles and the computer said 28.7, so happy with that! Current: TDV8 (3.6) RRS HSE



Past: TDV8(4.4) Vogue
Discovery 3 Commercial
TDV8(3.6) Vogue
TD6 Vogue
D2 V8 ES
D1 V8 ES
RR Vogue Classic

I have just done two full to empty fills and reset the mpg and miles at fill time. Both times the fuel computer gave a slightly different mpg than I was actually getting. Then i included the roughly 5% inaccuracy in my speedo, it over reads approx 5% at all speeds, and the computer was pretty much spot on.

I tend to get between 25 and 27mog on my TD6, which seems very low compared to others here. RR History
1988 2.4td Classic 1999 to 2020
1992 3.9efi Westminster Classic 2004-2005
2005MY L322 3.0TD6 Vogue 2016 to current

Low? I get 19 on my TD6 :/ must be knackered! 

My 2004 4.4 V8 returns a crippling 14.7 - I'm running it on LPG though which takes a lot of the pain (But not all!)

Overall, according to the 'Fuelio' app I have on my smartphone and based on several months driving now, my 07 3.6 TDV8 has returned 30.5 mpg. That's based on a range of driving styles, from short shopping trips to road trips abroad, and my daily 90 mile commute on a congested M27.

I'm very happy with that given the weight and performance of the car, and most people find it hard to believe.

The computer generally indicates a figure about 7% optimistic. 2012 TDV8 Westminster in the New Forest

Also: Land Rover Series 3 SWB, Mercedes 280SL, Classic Mini race replica, VW Golf SV
Previously: Audi A8, RR TDV8 Vogue, Audi Allroad, VW Golf GTI Edition 30, Audi A4 Avant, A8, A4 Sport, A6, VW Golf Mk5, Bora, Golf GTI Mk3, Jetta Mk3, Passat, Jetta Mk1, Golf Mk1

DarkWheel wrote:

My 2004 4.4 V8 returns a crippling 14.7 - I'm running it on LPG though which takes a lot of the pain (But not all!)

Hi...

2011 5L SC currently in with dealer having the wiring modification done to fix inaccurate reading, so a question please to those who own the same.

When filled to the brim, what does the trip computer tell you the mileage range is - mine before going in for work to be done showed ~338miles is that in-line with others?

Many thanks!

My 05 SC averages around 17mpg

On a 2,000 mile trip in Europe I averaged 20.1mpg with four of us in the car, bike rack on tow bar and the boot full to the roof, so not too bad overall!

cheers Alex

2018 Skoda Kodiaq vRS
2009 Caterham Supersport Race car
2007 M5 Touring
2005 Range Rover Vogue SE Supercharged
2004 SL55 AMG

sounds about right..i got similar mpg with my sc... ... - .- -.




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Sounds good. I recorded 33.8 on a run down to Tilbury and back the other week.

Seems the trick to good MPG is gentle gearshifts when pulling away at the lights, not minding sticking her at 60MPH on Cruise Control, and making sure she has good quality fuel in the tank.