GlosBoy wrote:

so, I messed up in my move.

Went from a D3 Manual to a MY10 D4 Auto and the MPG is a lot worse - about 80 miles less per tank full on the D4

You're not alone. I've done exactly the same and on a run today (filled up before I left, and filled up on return - someone else is paying my bill today!) the D4 did just under 27 mpg (lie-ometer said 32.something!). The D3 would have done about 30 on the same run. Ah well, I'd better start sending the begging letters again.

astonbuilder wrote:

I don't understand why most people seem to be getting worse mpg figures in the 3.0 than the older 2.7; it's cleaner, more powerful, supposedly more efficient officially and nobody goes 'backwards' in development???

I am using more of the performance more of the time, maybe that's the 'real' reason for most peoples decline in mpg?

My best figures in a 2.7 were in a manual on my commute to work of about 55 miles of which I could very often do about 50 miles in 6th gear and then about 90% of that on cruise at 70mph. In the D4 I'm getting a 'real' 10% better mpg overall. The RRS's I've used have been 1-2mpg better still...

That's just it, I don't use the performance, my driving style hasn't changed. I did wonder whether I was being a bit more heavy footed, but yesterday, definitely not. When I was at MIRA a couple of years ago, I was talking to a couple of LR engineers who were testing/comparing a FFRR, Merc GL, X5 and something else (old age = forget what), and at the time I had the D3 (with its usual issues). One of them made the mistake of saying "they're getting better". LR have been saying that since 1948. I'm not sure?

Serious question time to self: do I get rid of the D4 or do I endure the extra fuel costs? Hmmmm

GlosBoy wrote:

so, I messed up in my move.
Went from a D3 Manual to a MY10 D4 Auto and the MPG is a lot worse - about 80 miles less per tank full on the D4

But the manual was always more economic than the auto version, so you are not comparing like with like , and you say you are 80 miles less per tank on the D4, IIRC, the D4 has a tank that is a couple of gallons anyway smaller than the D3?

Ecosse wrote:

GlosBoy wrote:

so, I messed up in my move.
Went from a D3 Manual to a MY10 D4 Auto and the MPG is a lot worse - about 80 miles less per tank full on the D4

But the manual was always more economic than the auto version, so you are not comparing like with like , and you say you are 80 miles less per tank on the D4, IIRC, the D4 has a tank that is a couple of gallons anyway smaller than the D3?

crews control wrote:

Something strange is going on here... Is the 2012 8 speed D4 worse than the 6 speed 2011? My 2011MY is noticeably better on mpg than the old D3. The figures are clear to see each month and I'm not driving it like grandma!

caverD3 wrote:

You are driving in the real world. Not in a lab. see my previous post. A remap will give you better real world economy.

But I was also driving in the real world with the D3 too!

caverD3 wrote:

They have just got better at getting good economy under the test conditions meeting lower lower emmissions,.

I think this is actually the key issue - the figures are effectively theoretical as they involve a pre-set sequence that car manufacturers may be able to tune/set-up their vehicles to perform best to, rather than the real life conditions we face in the UK.
I suspect also that there are multiple software versions ie different maps in use by LR, and that individual driving style/road & traffic conditions may impact it a lot; also other factors like tyre pressure, whether the fuel burning heater cuts in, how you use the brakes or take advantage of the paddles for engine braking, etc., may also impact the figures.... and finally, don't believe the onboard computer, it even less honest than a politician

Paul White wrote:

Ah APL, you included the mileage on the boat didn't you?!!

Paul