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Mark
Mark, Renault Certified Technician
Category: Renault
Satisfied Customers: 1504
Experience:  Fully qualified technician and MOT tester
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for the second time and having paid £33 .. My 8 month old

Customer Question

for the second time and having paid £33 ..

My 8 month old scenic with 2230 miles is only returning 39 miles per gallon. Is this the norm? as the sales person informed me that I'd get in excess of 60MPG

This is what I got from my Grand scenic.

What should I do to improve my present MPG
Submitted: 2 years ago.
Category: Renault
Expert:  Mark replied 2 years ago.

Mark :

Hello, my name is Mark and I will try help you with this?

Mark :

What engine do you have?

JACUSTOMER-nmm4nfbc- :

The engine is a 15.00cc

JACUSTOMER-nmm4nfbc- :

Hi mark. Terry here.

JACUSTOMER-nmm4nfbc- :

a office worker with the car supplier told her the cold weather has an effect on fuel consumption.

JACUSTOMER-nmm4nfbc- :

she too has a 15.00cc Renault.

JACUSTOMER-nmm4nfbc- :

This company has a new supper supper computer they advertise this on Tv. so I'm booked in on Saturday.All I hope the guy operating it knows what he's doing.

JACUSTOMER-nmm4nfbc- :

My ex-renault grand scenic was returning 60+ mpg. same size engine heaver and a it was a 7 seated.

JACUSTOMER-nmm4nfbc- :

Hi Mark

Mark :

Do you know what power output it has?

Mark :

Hi

JACUSTOMER-nmm4nfbc- :

Ah you have me there

Mark :

What tax band is it in?

Mark :

B C or D

JACUSTOMER-nmm4nfbc- :

It's a motorbility car

Mark :

I mean for emissions

Mark :

If it wasn't a mobility car, what tax band would it be in?

JACUSTOMER-nmm4nfbc- :

Oh.I think it's B the lowest

Mark :

But your not 100% sure

JACUSTOMER-nmm4nfbc- :

No sure

Mark :

Does it have stop/start technology?

JACUSTOMER-nmm4nfbc- :

all the paper work is in the car which is in my garage 200 yards fro the house

JACUSTOMER-nmm4nfbc- :

yes to stop/ start

Mark :

So when you come to a junction or red light the engine cuts out?

JACUSTOMER-nmm4nfbc- :

yes

Mark :

Do you know how the consumption figures are calculated?

JACUSTOMER-nmm4nfbc- :

not a clue

Mark :

Like most people

JACUSTOMER-nmm4nfbc- :

yep

Mark :

I will give you a website where you can read how it's done.

JACUSTOMER-nmm4nfbc- :

regarding fuel consumption I think 39 is rubbish I could have bought a tractor with better

Mark :

The thing here is to remember manufacturers will use almost any method to lower the emissions for tax reasons.

Mark :

Whether the car will actually achieve those figures in real life driving.

Mark :

The consumptions figures are calculated on a rolling road, with no wind resistance and an average speed of 19 mph

JACUSTOMER-nmm4nfbc- :

my mate has a Pergot [ spelling?] doing a constant 56..5

Mark :

They also will not test a car until the engine has been run in.

Mark :

Yours is barely run in.

JACUSTOMER-nmm4nfbc- :

I'm comparing this 39 with my 60+ on the Grand scenic

Mark :

How did you determine your consumption figure?

JACUSTOMER-nmm4nfbc- :

on the cars on board computer

Mark :

No good

JACUSTOMER-nmm4nfbc- :

Oh why

Mark :

Because the way it works.

JACUSTOMER-nmm4nfbc- :

Um

Mark :

What else does the computer tell you

JACUSTOMER-nmm4nfbc- :

fuel con.= distance travelled milage left in the tank

Mark :

All based on averages from the last reset.

Mark :

Do you normally run on a full tank?

JACUSTOMER-nmm4nfbc- :

distance travelled

JACUSTOMER-nmm4nfbc- :

Yes….I never allow it to fall below 1/2 full

Mark :

That is also a problem

Mark :

You are carrying extra weight

JACUSTOMER-nmm4nfbc- :

again why

Mark :

What you need to do is fill the tank to the absolute maximum.

JACUSTOMER-nmm4nfbc- :

no usually there's only my self perhaps my mate some times

JACUSTOMER-nmm4nfbc- :

I fill to the top

Mark :

The weight is in the fuel

Mark :

When the car is tested the cycle is for only 4 miles

Mark :

They carry the minimum fuel required.

Mark :

What you need to do is fill the tank to the absolute maximum.

JACUSTOMER-nmm4nfbc- :

strewth

Mark :

Run the car for 100 miles and really nurse it. No hard acceleration, no hard braking.

Mark :

Then refill the tank to the max and then work out how many miles you got for the amount of fuel you put in.

JACUSTOMER-nmm4nfbc- :

that's my usual style of driving I'm elderly cruise control on the duel garrageway

Mark :

You then need to add at least 15% of the miles to this figure because of the weight of a full tank of fuel

Mark :

Read what I am saying.

JACUSTOMER-nmm4nfbc- :

I'm still confused why my mates car returns 55 and mine a miserable 39

JACUSTOMER-nmm4nfbc- :

OK mate

Mark :

Because you are looking at the computer and not what it is actually doing.

JACUSTOMER-nmm4nfbc- :

OK I'll recalculate using your advice

Mark :

I'll tell you what to to do.

JACUSTOMER-nmm4nfbc- :

go ahead

Mark :

Next time you fill up. Fill to the max. Reset all the computer readings to zero and then take the vehicle for a run on the motorway. Try not to exceed 55mph. Try to use cruise control as much as possible and leave the computer on actual mpg reading so you can see what you are actually getting at that precise moment in time. You will be surprised.

JACUSTOMER-nmm4nfbc- :

OK Mark. thanks for you time and help. I bid you good night.

Mark :

Click on the link above for some night time reading lol.

Mark :

Did the link work ok?

Mark :

Please remember to rate my assistance.

Mark :

Thanks

Mark :

Mark.

JACUSTOMER-nmm4nfbc- :

Yes the link worked and you'll get a good "school" report !!!

Full Size Image

Mark :

Cheers

JACUSTOMER-nmm4nfbc- :

What do youth say….no probs.

Mark :

lol

Mark :

No probs

Mark :

Thanks for thinking I'm a youth

JACUSTOMER-nmm4nfbc- :

cheers mate say well…………..Terry.

Mark :

Been in this game 35 yrs

JACUSTOMER-nmm4nfbc- :

still a youth I'm bordering 80years.

Mark :

Ah well

Mark :

I'll give you that one.

JACUSTOMER-nmm4nfbc- :

Cheers and I'll say good night and thanks again.

Mark :

Good night

Mark :

You forgot to rate my assistance

Mark :

I don't get paid until you do. :(

Mark :

Hi Terry. You can rate my answer by clicking on the smiley faces.

Mark :

Cheers.

Mark :

Do you need any further info Terry?

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