New car MPG

chrislusty · 22 Sep 2013 at 08:29

Have you reset the trip computer at all either? As although not allways accurate they are not far off, however if yours has not been reset the car could he spent time idling away and not going anywhere. This would then effect the overall readout.

godinman · 22 Sep 2013 at 09:21

Do a proper tank to tank calculation as obc's are sometimes crap.

Uther · 22 Sep 2013 at 09:54

The onboard fuel consumption figures on our new car are hilariously bad, ranging from 30 MPG up to around 120 MPG! I think it just makes a figure up to display.This on a 1.6 diesel.
The only way to tell is fill up, zero the trip meter, and work it out from there.

Dr Who · 22 Sep 2013 at 10:17

Quite simply, you need to drive like a kitten to get quoted figures. However, I can get over 20mpg round town in my Merc 320 CLK, so either something is wrong (fuel mixture may well be reset at first service) or it is your driving.

Howard · 22 Sep 2013 at 18:09

robfosters said:
1.6

..

Automatic

There's yer problem.

Jez · 22 Sep 2013 at 18:50

I am not sure i would expect much more than 20mpg from pure urban driving from a modern and therefore heavy petrol automatic regardless of engine capacity?

Dr Who · 22 Sep 2013 at 18:56

Jez said:
I am not sure i would expect much more than 20mpg from pure urban driving from a modern and therefore heavy petrol automatic regardless of engine capacity?

Used to get more than that out of my Golf GTi DSG around Bristol, was closer 30 mpg.

My CLK320 Auto does more than 20mpg, closer 24 on urban only if I drive it carefully.

Jez · 22 Sep 2013 at 19:39

The problem is that "urban" means different things to different people. Your CLK would definitely not do 20mpg average on the urban i was imagining.

Russinating · 22 Sep 2013 at 20:30

robfosters said:
No i'm not calculating that way Janesy. I'm getting the mpg reading from the dashboard info thingie.

I wouldn't trust that. Work it out manually, either just in Excel or use something like Fuelly. You may be interested to see other people's MPGs too: http://www.fuelly.com/car/vauxhall/astra/2013

My brand new car's dashboard says I'm getting 47 whereas I'm actually getting 42.

breadturbo · 23 Sep 2013 at 02:17

20mpg surely is still bad for a 1.6 auto or not?
My espace isn't far off that, and that's a 3.5v6 auto

Participant · 23 Sep 2013 at 06:09

But we don't know if he's getting 20mpg or not, so until he's done that calculation it's pointless following it up.

[TW]Fox · 23 Sep 2013 at 07:35

Dr Who said:
Used to get more than that out of my Golf GTi DSG around Bristol, was closer 30 mpg.

DSG is not an automatic, it has no torque converter hence no fuel consumption penalty. It is an automated manual.

My CLK320 Auto does more than 20mpg, closer 24 on urban only if I drive it carefully.

I very much doubt this, that won't be pure short town work. My 530i manual wont do that and the BMW six was noticeably more fuel efficient than the Merc equivalent of the time!

Most people who claim good town mpg are not doing short stop start trips from cold.

GravyMonster · 23 Sep 2013 at 11:03

Howard said:
There's yer problem.

Agreed.

An asthmatic 1.6 joined to an auto with a torque converter doesn't make for good MPG.

blitzwing85 · 25 Sep 2013 at 10:47

MPG figures mean very little really. MPG varies massively just from day to night driving.

A 10 minute drive to work in the morning and mine gets 45, 50 if I drive economically. The same journey at 11pm gets 65mpg.

This is just going off the computer but it shows how much stopping a few times hurts your economy. At night, I never stop, just slow down a little for junctions and corners. During the day, I stop 7-8 times on the journey.

Personally, I find my MPG suffers because of other drivers. If it's just me on the road, I know exactly when to ease off when coming to junctions etc and very rarely have to brake - meaning I get great MPG. But stick other cars in your way slowing down at weird times, braking excessively and just general traffic congestion and figures tumble