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C4 1.6 HDi MPG

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Sat Jun 14 2008, 06:13am
Member No: #1827
Joined: Dec 31 2007
Location: Krakow, Poland
Nearly 1200 miles?! I was hoping, at best, to get 1200 kilometers from my (to be delivered) C4 1.6. They must have had some very, very, very optimal conditions and a very conservative speed ...I'd guess no faster than 70 KPH. And for sure that 308 had a manual transmission.

As a side note: my wife and I were considering the 308 but for whatever reason Peugeot doesn't offer it with the EGS-style transmission and that was one of our pre-requisites for the new ride.

Did a quick bit of googling: here is a link mentioning that the maximum speed limit is 110 kph, about 65 MPH and the more typical limit is 110 KPH.

More info here ...This indeed was a manual and it has, I believe, the 110 HP (80kW) version of the 1.6 HDi engine. They were using low rolling resistance tyres, though, which surely helped a bit. I'd also guess... absolutely no unessential electrics (radio, windows, A/C, etc). Do headlights always have to be on in AUS? Or is that optional?

Lastly, I noticed that the previous holder of "most efficient" was a Hyundai ...and they'd also set the record in Australia. Which makes me think "fairly flat, fairly straight" roads.
Sun Jul 06 2008, 05:38am
Member No: #1731
Joined: Dec 15 2007
Location: Walsall West Midlands
Guess Im just a learner at the mpg game after reading the 1000+ miles on a tank of diesel. My C4 1.6 HDI has 3200 miles under its belt so far from being run in. Yesterday I travelled 202 miles from Birmingham to Sheerness on what were the quietist roads I have ever seen on a Saturday. M6, M42, M40, M25, M26 and then the M20. I must have seen less than 20 lorries and many car drivers were playing the economy game. I set my cruise at 56 mph at Great Barr Birmingham and not once did I need to touch my brakes until I came off the M20. Computer readout 69.6mpg at an average speed of 55mph. Getting to love my C4 more and more each day.
Thu Feb 25 2010, 11:53am
just wanting to get my mpg figures out there. 56 plate 1.6 hdi on 54000 miles- avg speed 34 and avg mpg 58.8. I do about a 3rd city driving and the rest on a roads.
Fri Feb 26 2010, 02:29am

Member No: #8137
Joined: Mar 08 2009
Location: Kent, UK
It would be nice to know what ambient temperature the Aus trip had. The HDI is at it's best with an air temperature of about 24C.
Fri Feb 26 2010, 03:37am
Well I just checked my MPG readings yesterday, and it shows 50.4mpg, driving all the time in city to work from work etc. not bad i think
Fri Feb 26 2010, 09:59am
I use mine for my work, stopping and starting all day 40+ times and the computer reads 54.6 Mpg and judging by the amount of fuel left in the tank this week that's about right. !o@k
Fri Feb 26 2010, 03:18pm
Member No: #5799
Joined: Oct 16 2008
Location: Durham
MAN I'm totally stumped now. After reading this thread I cannot get it into my brain how the 1.6HDi mpg can vary so much. Ok I understand temperature and weather conditions etc but to get vast differences is unreal to me. EG let's take around town driving. Ee have some members like myself who struggle at 45mpg ish and other members who also drive around town and average about 10mpg more. I'm a mechanic by trade and surely putting a/c on, radio on, heaters etc that there can be such a vast difference and please, this is only my perception.

Cheers Paul
Sat Feb 27 2010, 03:27am

Member No: #8137
Joined: Mar 08 2009
Location: Kent, UK
During winter running if you have the heater on full blast then the engine is struggling to maintain a working temperature, particularly around town where you are on a light throttle or idling. The engine then adjusts fuel timing, quantity and post combustion injection to keep the FAP hot enough. Also from all I have read I think Citroen has deliberately over-cooled the engine to allow a safety margin when thrashed, and the degree of over-cooling varies from one batch of thermostats and sensors to another. With an engine this efficient small changes in setup reflect bigger effects.

It is also impossible to compare 'round town' from one location to another as sitting in stopped traffic is worst consumption but a steady 40 mph is close to best possible. The only true comparison is open road driving at set speeds.
Sat Feb 27 2010, 05:17am

Member No: #82
Joined: Jan 22 2007
Location: Hoylake
gipdude wrote ...
et's take around town driving. have some members like myself who struggle at 45mpg ish and other members who also drive around town and average about 10mpg more.

Dare, I say it, it's all in the right foot, assuming the car is on good condition.

Think about when you waste fuel and anticipate.
E.g., when slowing down, take your foot off a 100m or earlier.
Always be in the right gear.
Don't rev over about 2.7K rpm
When the engine is cold, keep the revs down for the first few hundred metres (cold engines consume huge amounts of fuel).
When crawling in traffic, just use the clutch and crawl forward with the engine idling.
Take your foot off when going down hill.
Use the speed limiter in 40mph zones. &c. &c.

If the weather is cold, below 5°C, consider a winter grille for the front of the car, as the engine does run cool - so there's no problems when cruising around the Med!
Sat Feb 27 2010, 09:52am
I am sure that in the summer when the AC will be on a lot the average will drop quite a bit..
Sat Feb 27 2010, 12:05pm

Member No: #1
Joined: Aug 07 2006
Location: Northumberland
Bodger wrote ...

I am sure that in the summer when the AC will be on a lot the average will drop quite a bit..

Not a problem in cars with Auto Climate as it cuts in and out and the HDi's torque means little additional load so consumption isn't badly affected
Sat Feb 27 2010, 04:35pm
Wow Thats good to know Dave..
Sat Feb 27 2010, 04:45pm

Member No: #2
Joined: Aug 12 2006
Location: Manchester
If you have Climate control. Just leave it in Auto all the time. Doesn't drastically affect fuel consumption or power at all.
Tue Mar 02 2010, 12:57pm
Is it OK to leave it on auto when you turn off ignition and on again,
Tue Mar 02 2010, 02:31pm

Member No: #2
Joined: Aug 12 2006
Location: Manchester
Yep perfectly fine. Mine is set to Auto at all times. Never gets turned off.
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