Update on Fuel consumption - Still bad?

Its been a little while since I wrote a post about MPG for my E52 so thought it was time for an update!  You might want to read my earlier post here first:

https://www.e52lowdown.com/2021/11/elgrand-e52-mpg-how-bad-is-it-really.html

I have covered 6500 miles since I wrote my last post about this and have been recording my miles along with fuel intake the whole time, and also tried a couple of things to improve it along the way.  Just to recap for you, my driving style is very much to the speed limit, so my bus is at 70mph on a motorway rather than in the slow lane trundling along at 55 where I am sure you would be able to improve on these figures.

The table below shows the first set of figures that I recorded and is largely similar to the previous post. It is a very slight improvement but that could be that I am being more careful and not seeing what my V6 can do.

Litres

KMs

KM/L

MPG

38

310

8.157895

23.0445

38

285

7.5

21.18608

47

397

8.446809

23.86063

31

288

9.290323

26.2434

36

267

7.416667

20.95067

27

191

7.074074

19.98292

39

282

7.230769

20.42555

44

335

7.613636

21.50708

56

451

8.053571

22.74981

56

495

8.839286

24.9693

44

402

9.136364

25.80849

37

329

8.891892

25.11791

55

485

8.818182

24.90969

42

404

9.619048

27.17198

48

475

9.895833

27.95385

39

314

8.051282

22.74334

25

218

8.72

24.63234

702

5928

8.444444

23.85395

At this point I was looking at any other ways I could improve my efficiency and saw some articles about Redex.  Apparently it helps to clean your fuel lines and engine which in turn boosts its efficiency so that it isn't working against debris and sludge. I used a 500ml bottle of Redex over three tanks of fuel.

I also required new tyres as the existing Japanese tyres were starting to crack.  I researched the options and chose to put on four brand new Michelin Primacy 4 tyres.  My Elsie also had some odd size tyre on it before which was wider than the Nissan recommended which was also making my speedo more inaccurate.  At 70mpg my old tyres were around 10% over, and with my new Michelins it is now around 6%.

With these changes, surely my MPG is now going to be amazing!  Here you go...

Litres

KMs

KM/L

MPG

57

500

8.77193

24.77904

45

396

8.8

24.85833

133

1158

8.706767

24.59496

39

363

9.307692

26.29246

38

294

7.736842

21.85511

37

319

8.621622

24.35444

62

551

8.887097

25.10436

28

243

8.678571

24.51532

72

595

8.263889

23.34392

80

692

8.65

24.43461

30

228

7.6

21.46856

39

364

9.333333

26.36489

660

5703

8.640909

24.40893

One thing I do have to remember with these figures is that my new tyres have most likely made the numbers worse and better at the same time.  The tyres themselves are rated as good fuel efficiency, but now that my gauge is more accurate my KMs are going up (a tiny bit) slower.

I think I have improved the efficiency but its still not anything you would be able to boast about.  There is some talk on one of the Facebook groups of resetting the ECU which I might try next, although aftter that I think I am out of options.  I think us Elgrand owners have to remember it is a 3.5 litre V6 engine and getting mid 20s for MPG is maybe already doing well.

I will keep you posted.

 

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