<i>. I must admit, that most of my rides are really short runs, about 4 miles distance from home to work in busy Edinburgh morning and evening peaks traffic</i>

4 miles is not enough to fully warm up a diesel when cold.

Stop/start when engine is cold is the most inefficient motoring possible.

Over 25mpg is therfore not bad.

(I would use the bus!)

Hello everyone and thank you all for your advise - it's much appreciated:)

On the long runs MPG seems to be ok, with about 53MPG cruising at 65mph and around 45MPG at motorway speeds, being gentle of course with an acceleration in both cases.

There is about a 10 mpg difference on my Peugeot 406 between hot and cold running and that's driving in a rural area so if you consumption is good on a run it will be the kind of driving you have to do that will be causing the problem.

Modern direct injection diesels are a victim of their own success in this regard, because they are so fuel efficient they don't generate much heat and so take a long time to reach working temperature, but on long journeys they come into their own.

Don't worry over comments about pensioners, I don't mind being a pensioner - just wish I was a bit younger.

Manufacturers' figures are with a HOT start(20-30.C).This is nothing to do with the manufacturer but is a Government regulation.

Thanks. Still doesn't explain how poor the economy is compared to my MK2.. I read that I should select gears to sit around 2-2200rpm, which I've tried today, and am still seeing below 50mpg on two 40mile runs of mixed roads driving gently...

...the diagnostic check revealed no problems and the garage managed 52mpg on a road test. Yes, I can get an indicated >60mpg if I reset the trip with a light throttle... The averages I'm comparing though are tank fulls of fuel over hundreds of miles against what I got from my 2006 1.5dci on similar journeys. Comparing both these figures against the 'published' ones. So it's back to contacting Renault themselves for an explanation...

My Mother uses a 2008 Mondeo 2.0 TDCi Estate for similar journeys to you, to and from work in heavy traffic, about 7 miles either way.

It gives 35 MPG according to the computer.

Previous car, a 2005 Renault 1.6 petrol engined grand Scenic 2 managed 29.

She was very tempted to get a newer Scenic, but went for the Mondeo. I would have expected better MPG than you are getting from this engine,

Hi everyone,

I finally solved the problem!!! Last week I noticed I have lots of air in fuel lines, went to Renault service and got a fuel filter replaced + I also asked to replace air filter at the same time (the reason for it is that someone advised me that chocked air filters may badly affect fuel economy).

Result - no more air in fuel pipes and feels like completely different car, engine runs smoother, much better response to acceleration and the best thing fuel consumption in town went down from slightly over 30MPG at the best (pretty much no difference beetween winter and summer) to well over 40MPG now (in the same temperature range of around 20-25 degrees celcius)

So sorry, but all the talking about 25MPG in town being ok for this engine is just a bulls... NO WAY below 30MPG is ok for 1.5dci- this car in town, even on short, cold runs, should do closer to around 40MPG, otherwise something is wrong

So a regularly serviced Renault has a blocked air filter? And needs a new fuel filter.

Sums up my views on the company and its dealers.

Hello Squall,

i've done a search on the net on the fuel consumption of this car and come up with this post. I have just purchased a 60 plate 1.5 dci 110 and what you describe is almost exactly the same with the car i have. I drove it from Preston back home to Cambs at more or less 65mph all the way and couldn't better 53mpg. With this kind of driving and given the reported figures i expect over 60mpg. I consider i know how to drive economically as i could get 55mpg on the motorway at 70mph out of my previous 1.8tdci Focus. Urban consumption is just as you reported too - 30 at best.

Anyway, it seems to me it is still on its original fuel filter as i asked the dealer if the fuel filter gets changed on the service schedule and they said no, althought the air filter does. Which begs the question when does it get changed!? It can't last forever! Anyway, my question to you is, what did it cost to change the filters?

Thanks, Andy

Edited by andyp24 on 22/11/2013 at 11:43

Hi All,

interested to hear how you're all getting on with your Scenic III consumption. I haven't done anything with mine yet in the way of services and filter changes (none were or are due following purchase last Nov). I haven't event reset the avg mpg read out so my figure is an avg since November for town driving with intermittent, very gentle 20mile round trips on A roads. The reading is 42.1mpg. I'm not thrilled with this but it is very comparable to my focus tdci. What's annoying of course is how Ford claim the average for that engine is 50 while Renault claim 65, yet they work out the same when at the very least i was expecting an improvement. Perhaps if i do some of those filters there will be some improvement.