Renault Laguna II - Phase 1 - Engines - Average MPG from 1.9 DCi Engine - Page 9 - Renault Forums :: Independent Renault forum

View Poll Results: What is your avarage MPG?
0-10 MPG 1 0.06%
11-20 MPG 6 0.38%
21-30 MPG 85 5.32%
31-40 MPG 498 31.14%
41-50 MPG 868 54.28%
51-60 MPG 116 7.25%
61-70 MPG 15 0.94%
71-80 MPG 1 0.06%
81-90 MPG 1 0.06%
91-100 MPG 8 0.50%
Voters: 1599. You may not vote on this poll

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post #41 of 380 (permalink) Old 16th April 2006
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Usually stick to Shell fuel, as I've got a Pluspoints collecters card, and the Shell garage in Faversham is usually cheaper than the Tesco's garage!

Get between 45 & 50mpg on varied A road (60mph) and town (30mph) commuting. Used to get 50-60mpg over the same journey before the cars first service! Noticed a drop in mpg straight after the service and it has'nt regained it, although have now had 2nd service and it's stayed the same.

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post #42 of 380 (permalink) Old 6th May 2006
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Quote:
Originally Posted by Horatio

The result? 46.3 or 47.0 mpg, depending on which of the two figures you'd rather believe (it kept flitting between the two - yes, the resolution of the fuel economy display is as crap as ever on the 2005 model.)

I think that is because th computer calculates in litres/100km ( or whatever the metric equivalent is) and converts it to mpg.

We had a Picasso with similarly irregular readings, increments of about 0.7mpg. When we went to France and changed speedo etc to km/h the trip computer incremented in 0.1 litres/100km for fuel consumption. Just to compare I flicked back to mpg and increments were approx 0.7mpg, back on metric and consistantly 0.1l/100km.

So it is not just renault it is the "coversion" between metric and imperial that brings up the discrepancies.



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post #43 of 380 (permalink) Old 10th May 2006
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I had a hunch it'd be something like that, though the Clio's trip computer doesn't seem to suffer from the same 'stepping' problem, so I wonder why the Laguna's has to. If it's only accurate in 0.7mpg increments, then why even bother with the decimal place?

On the subject of fuel economy, I hit a bit of a revelation yesterday. As I mentioned before, I run the car pretty much exclusively on Shell, using BP when I can't find Shell. I think it's had one tank of 'something else' before now too, but I forget which brand.

But on the whole, I've been using Shell and getting a return of about 42mpg on the motorway - that's cruising at around an indicated 80 where traffic permits. Yesterday, I filled up with regular BP diesel (not the Ultimate stuff) at Knutsford services on the way down to London - by the time I got to the end of the M1, I was showing over 49mpg, and I'd been making no special efforts to achieve that figure.

Bearing in mind that my previous best on the motorway, through careful driving was around the 47 mark, that's not bad going. I'll make my next tank Shell again and see if the mpg drops back down. If it does, then I may well go out of my way to buy BP in future.
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post #44 of 380 (permalink) Old 10th May 2006
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I find that when I use shell, economy isn't quite so good as when I use Esso. I don't tend to use BP as the BP garages are the most expensive in our area, even for stadard diesel.#
Also I have noticed a general improvement in economy since the weather warmed up a bit ( Cornwall is still only managing max of about 15-16 degrees), then I have always noticed a dip during the winter.
Economy now is up to 49mpg ( hopefully reaching our summer average of 50.4 mpg soon)for our normal drive to from work which does not include ANY dual carriageway or M'way. On a recent 100 mile drive on mixed driving A & B roads I reset the computer before I left and when I got back home computer was showing 58mpg.



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post #45 of 380 (permalink) Old 10th May 2006
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Quote:
Originally Posted by Horatio
I had a hunch it'd be something like that, though the Clio's trip computer doesn't seem to suffer from the same 'stepping' problem, so I wonder why the Laguna's has to. If it's only accurate in 0.7mpg increments, then why even bother with the decimal place?

It is not a linear conversion. When you are getting mpg figures in the low 30s you will find the trip computer increments in smaller steps, more like 0.2 or 0.3. If you are nearer 60mpg you will get a resolution or 1mpg or more.



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