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C4 2.0HDi MPG

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Dickie   
Fri Apr 24 2009, 02:47pm
Member No: #138
Joined: Feb 27 2007
Location: St. Albans
Is it really that clever? I assumed that it was a simple sum of average mpg over the past few minutes times the fuel left in the tank.
Jimux   
Mon Apr 27 2009, 04:08am

Member No: #8137
Joined: Mar 08 2009
Location: Kent, UK
blueclouduk wrote ...

Over 4500 miles on the clock now.

Average mpg is 40.3

Last night coming back from West Lothian, with a top box, and a mad cross-winds, she averaged 45.5 mpg.

Not bad for a big oil-burner with the aerodynamics of a brick.

There is a difference between aerodynamics and "perceived aerodynamics". "perceived aerodynamics" are what the eye sees, ie the shape of a vehicle and frontal area. Aerodynamics are the actual drag factor. The difference is that areas such as grills and obstructions under the vehicle make a considerable difference to the drag. The C4P has a low drag factor. That is why the fuel consumption changes slowly with changes in speed. It is however a heavy car, which is why consumption changes dramatically with small changes in gradient.
sammys hdi vts   
Mon Aug 17 2009, 06:29pm
My c4 coupe is ill with a failing turbo that money and replaced valves doesn't seem to be curing however fuel economy is really bad at the moment. The trip computer is saying 44 mpg, but diesel pump/distance is saying more like 34mpg. Anyone checked trip computer vs fuel pump readings?
Darren   
Tue Aug 18 2009, 01:40pm
Member No: #5650
Joined: Oct 03 2008
Location: Portsmouth, UK
Jimux wrote ...

blueclouduk wrote ...

Over 4500 miles on the clock now.

Average mpg is 40.3

Last night coming back from West Lothian, with a top box, and a mad cross-winds, she averaged 45.5 mpg.

Not bad for a big oil-burner with the aerodynamics of a brick.

There is a difference between aerodynamics and "perceived aerodynamics". "perceived aerodynamics" are what the eye sees, ie the shape of a vehicle and frontal area. Aerodynamics are the actual drag factor. The difference is that areas such as grills and obstructions under the vehicle make a considerable difference to the drag. The C4P has a low drag factor. That is why the fuel consumption changes slowly with changes in speed. It is however a heavy car, which is why consumption changes dramatically with small changes in gradient.



This is similar to the differences between my old VTR Coupe and my VTS HDi.

Old VTR was lighter with a much lighter engine, and on hills it kicked out low 30's high 20's in MPG. My VTS does similar figures on hills, however on a flat, the VTR doesn't touch it on economy.
MIM   
Mon Jun 28 2010, 09:07am
Member No: #3298
Joined: Apr 15 2008
Location: Brighton & Hove, England
Had mine over 2 years now and one thing that seems to be consistent is that below 70 mph I get close to 50mpg, but around 75 to 78mph that drops to 42-44 mpg. Also I agree with earlier posts that hills do increase mpg, but air con doesn't on a run.
One last thought, the trip computer is a bit optimistic. When I calculate mpg by hand, it's about 10% out
PPP7   
Mon Jun 28 2010, 02:52pm
Member No: #135
Joined: Feb 25 2007
Location: South Midlands
MIM wrote ...
one thing that seems to be consistent is that below 70 mph I get close to 50mpg, but around 75 to 78mph that drops to 42-44 mpg. Also I agree with earlier posts that hills do increase mpg, but air con doesn't on a run.


I get a consistent 47MPG on the computer with cruise/limiter set to 75 in the summer.
What ruins the fuel consumption on this diesel is cold weather below 12°C

Last winter was bad for the fuel consumption due to the very long cold winter/spring....it can struggle to reach 40MPG.

Next winter I am going to cover up the radiator as much as possible...there is a part number somewhere on this forum for the official winter radiator cover.
pedal   
Mon Jun 28 2010, 03:54pm
Member No: #503
Joined: Jun 27 2007
Location: Derby
.. I normally have 48mpg from my mapped 1.6gp, but I just came back from cornwall 400miles and only managed 31mpg, had fill up 30miles from home aswell...lol... same trip last year when the other half hated me (she actually called me James May!... i got 850+ before I had to fill up.
the winter radiator covers a life saver when its cold, you actually get warm air with in a minute or two aswell, I left mine on till its was basically 15C all the time.
superstan1975   
Tue Aug 10 2010, 10:20am
i have had my 2.0 hdi vtr+ for a week now i use it to go from darlo to west yorks daily i get average of about 55mpg over a 83 mile trip inc town and motorway driving sometimes i see that briefly go to 60+ but thats at 50mph through the roadworks mind you better than my range rover which does 18 if im sensible
MIM   
Sun Jun 05 2011, 04:10pm
Member No: #3298
Joined: Apr 15 2008
Location: Brighton & Hove, England
A further update on mpg: I've had the car over 3 years now, and done almost 16,000 miles. The overall average is 36 to 37mpg calculated by hand (39 mpg indicated on the trip computer). Around town it's low 30's mpg, on a run mid 40's.
trev h   
Mon Jun 06 2011, 04:02am
Member No: #10864
Joined: Sep 11 2009
Location: kent/se london
Makes my full auto look good, getting 38mpg overall, have had it in the low forties but it's no fun if SWMBO isn't screaming. LOL
PX   
Mon Jun 06 2011, 10:43am
Member No: #6230
Joined: Nov 18 2008
Location: Redditch
Looking at the above I must be lucky.

Just done 2 150mile round trips (95% on motorway at a constant is 63 miles per hour) and got over 60MPG both times.

On the same trip a couple of days later got 43MPG when I was touching 75, it seems much above 60MPH and MPG drops by 50%

2 year old C4GP exclusive.


loggamatt   
Mon Jun 06 2011, 11:50am
Just got a 2.0HDi VTS Coupe a month or so ago... haven't really done a lot of keeping track of the fuel economy yet because the cruise control is broken (getting fixed this week!) and I don't have the patience to drive for economy without the CC.

But I did manage to do an economy drive trying to stick to about 68MPH for about 100 miles and I got over 60MPG. However, as others say, my experience is that this drops alarmingly to around 40MPG as you approach 80MPH.

I used to have a 1.6 HDi VTR Coupe and there was nothing like the variation in MPG between 70 and 80 that you seem to get with the 2.0.

Still I'm not unhappy with 60MPG+ at around 70MPH... I'll just have to make sure I have plenty of pennies saved up before I push it about 70!

What do people think is the absolute most fuel efficient speed for a 2.0HDi so I know what to set the cruise control to?
PPP7   
Mon Jun 06 2011, 12:14pm
Member No: #135
Joined: Feb 25 2007
Location: South Midlands
loggamatt wrote ...

What do people think is the absolute most fuel efficient speed for a 2.0HDi so I know what to set the cruise control to?


The same speed as trucks are limited to, 56MPH is the most fuel efficient speed.

I tend to cruise around 80 because it's so boring going any slower on my 40 mile journey to work which is 90% motorway.

I am getting 42-44MPG at the moment.

Also what kills the MPG is that I drive quite early in the morning when the air temperature has been usually below 10°C,
where as my journey home when the air is warmer I do get better MPG.

I still have my cold weather shield on as well, because it doesn't come off easy, and it isn't very summer like with constant hot days.

There are so many variables as to why some people get better MPG than others, so you can't compare unless the same driver that get's 50MPG drives another car same type, that normally only gets 40MPG, and still achieves 50MPG.
loggamatt   
Mon Jun 06 2011, 01:13pm
Hamilton wrote ...

The same speed as trucks are limited to, 56MPH is the most fuel efficient speed.


Even with the gearing on the VTS? I would imagine the engine would be struggling in 6th gear at that speed...
PX   
Tue Jun 07 2011, 02:24am
Member No: #6230
Joined: Nov 18 2008
Location: Redditch
I have found RPM at either 1750 or 2000 is best for my mpg, hence me driving at 63mph in 6th!.

I guess the 50% reduction in MPG at higher speeds is due to the size of the C4GP?

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