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Hi, I'm new to owning a Honda, but i've just taken delivery of a new Civic diesel (Feb 08).
I've covered 1200 miles in 3 weeks and I must admit I'm a bit disappointed with the economy. After 3 refills (47 MPG, 48 MPG and 41 MPG) measured from the pump, not the internal gauge. The first two tankfulls were mainly motorway/dual carriageway to work and back, 36 miles each way, travelling at 70 to 75 MPH indicated, which according to my GPS equates to 65 to 70 (why is the Civic digital speedo so inaccurate). The third tankfull was a cross country journey with a lot of it stuck in traffic on a Friday afternoon on the M25. I am trying to run the car in as gently as possible, no fast acceleration and keeping the revs down to below 3000 RPM.
I never get 6 eco lights come up on the display unless i am going down any sort of slope with my foot off the throttle. Is this how everybody's ecometer works or have I got a duff car.

sorry I should correct the date, took delivery in January 2008
 

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Hi, I'm new to owning a Honda, but i've just taken delivery of a new Civic diesel (Feb 08).
I've covered 1200 miles in 3 weeks and I must admit I'm a bit disappointed with the economy. After 3 refills (47 MPG, 48 MPG and 41 MPG) measured from the pump, not the internal gauge. The first two tankfulls were mainly motorway/dual carriageway to work and back, 36 miles each way, travelling at 70 to 75 MPH indicated, which according to my GPS equates to 65 to 70 (why is the Civic digital speedo so inaccurate). The third tankfull was a cross country journey with a lot of it stuck in traffic on a Friday afternoon on the M25. I am trying to run the car in as gently as possible, no fast acceleration and keeping the revs down to below 3000 RPM.
I never get 6 eco lights come up on the display unless i am going down any sort of slope with my foot off the throttle. Is this how everybody's ecometer works or have I got a duff car.

sorry I should correct the date, took delivery in January 2008
Hi Beeno !
First of all, a turbo diesel has to be thrashed in a intelligent way to be run-in proper and that will give you real good consumption oerformance. Poor run-in = poor compression cause the rings dont get sealed enough and therefore poor compression = less power & torque that leads you to press on that pedal for more acceleration or speed stability. If your under 1500 miles, its not too late to catch-up with some good running-in, go to the WIKI and check running-in diesel engines ! You'll understand what happens inside an engine. As the milage goes by, you will see a great difference of consumption. According to older civic riders, after 5000 miles only will the car be less greedy on fuel. I have the same problem as you regarding fuel consumption with much lesser milage than you, only 170 miles on clock !! Patience ... it's a diesel and they require a lot more time than petrol civics.
 

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Hi Beeno, welcome to Civinfo

3000 rpm is a lot for this engine, I guess your previous car was a petrol?
The general rule with a turbodiesel: apart from driving on from standstill, take one gear higher as you would on a petrol in the same speed range. I often accelerate quite swiftly in 1st gear from standstill (not spinning my wheels but swiftly) then change to 3rd at some 30 km/h and to 5th at 45-50 km/h, on longer city strips I add my "VAT" to the allowed 50 km/h and at some 58 km/h displayed (maybe 55 km/h real speed) I go on with 6th, as long as there are no steeps to take it's no problem, really. I know this would murder a petrol engine but with a high-torque diesel it's OK. The skipping of gears also saves fuel (and the clutch).
On the Autobahn - if I'm not in a hurry (or in a mood for low-flying :p) limiting speed to 150 km/h is very economical (130 would be more economical but then some old van might honk at you to go faster).
Using the cruise control will save you another 0,5 l/100, whereas turning off the aircon brings no (measurable) savings.
With the above tips, you should get between 5,5 and 7 l/100 km
it's still not as good as it gets (my best value was about 4,6 or 4,8 I don't remember exactly) but this is possible only with really lame driving and it's not what the Civic was made for is it? [smilie=cheeky-grin:
Cars with smaller engines and less weight will have better economy still, but one can't have everything...
 

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Hi Beeno, welcome to Civinfo

3000 rpm is a lot for this engine, I guess your previous car was a petrol?
The general rule with a turbodiesel: apart from driving on from standstill, take one gear higher as you would on a petrol in the same speed range. I often accelerate quite swiftly in 1st gear from standstill (not spinning my wheels but swiftly) then change to 3rd at some 30 km/h and to 5th at 45-50 km/h, on longer city strips I add my "VAT" to the allowed 50 km/h and at some 58 km/h displayed (maybe 55 km/h real speed) I go on with 6th, as long as there are no steeps to take it's no problem, really. I know this would murder a petrol engine but with a high-torque diesel it's OK. The skipping of gears also saves fuel (and the clutch).
On the Autobahn - if I'm not in a hurry (or in a mood for low-flying :p) limiting speed to 150 km/h is very economical (130 would be more economical but then some old van might honk at you to go faster).
Using the cruise control will save you another 0,5 l/100, whereas turning off the aircon brings no (measurable) savings.
With the above tips, you should get between 5,5 and 7 l/100 km
it's still not as good as it gets (my best value was about 4,6 or 4,8 I don't remember exactly) but this is possible only with really lame driving and it's not what the Civic was made for is it? [smilie=cheeky-grin:
Cars with smaller engines and less weight will have better economy still, but one can't have everything...[/QUOTE]
Excuse me dear civicfan, but it seems that there are no mention what so ever regarding the revs in the technical manual ? I suppose it to be gradual as milage increases and 3000 rpm wont be so much if you dont stick to it !, its just a peak of a fraction of a sec while pulling on to the next gear to rev around 2000 to 2500 rpm, please bear in mind that these modern engines with precise machined bores has much less milage to run-in and the first 700 miles or 1000 km are indeed the most important, this is the occasion given to get those seals bedded proper. There is no catching up possible if one drive 3000 miles with 1500 - 2000 rpm and decides to increase rpm later on cause the rings get oval instead of bedding in the total circonference, thus leading to poor compression ... etc ... as said previously.
 

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Excuse me dear civicfan, but it seems that there are no mention what so ever regarding the revs in the technical manual ? I suppose it to be gradual as milage increases and 3000 rpm wont be so much if you dont stick to it !, its just a peak of a fraction of a sec while pulling on to the next gear to rev around 2000 to 2500 rpm, please bear in mind that these modern engines with precise machined bores has much less milage to run-in and the first 700 miles or 1000 km are indeed the most important, this is the occasion given to get those seals bedded proper. There is no catching up possible if one drive 3000 miles with 1500 - 2000 rpm and decides to increase rpm later on cause the rings get oval instead of bedding in the total circonference, thus leading to poor compression ... etc ... as said previously.
As for technical terms I don't know, I am no engineer, but I have driven some 500.000 km in total, with 3 different Diesel cars, in the manner described above (including the run-in phase) and none was later consuming oil or such... Of course I will drive more dynamically if I'm in a hurry (or in the mood to do so) but it has become rather an exception (we all get older don't we?) In so many words - maybe it seems risky for the engine but it doesn't show in (my) practice
 

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Discussion Starter #9
thanks for all the replies, i'm very grateful.

It would seem that there are still a lot of theories on how a diesel should be run in, there seems to be no definitive answer. I have just filled up with diesel and the MPG was 47. My use of the car tends to be mostly motorway journeys to work and back (35 miles each way) so I cannot avoid some of the 'don't does' specified (avoid motorways, constant speed driving etc.).
I am drving in the 75 to 80 MPH range (70 to 75 real MPH) and still seem to be getting far better MPG than my old astra convertible, so I should not complain.

I just find it annoying that Honda can get away with advertising such MPG figures which are so unacheivable in real life driving conditions.
 

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............

I just find it annoying that Honda can get away with advertising such MPG figures which are so unacheivable in real life driving conditions.
Thats because ALL manufacturers figures are achieved on a rolling road
They bear no resemblence whatsover to real driving.
Its only to appease regulation requirements
 

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Discussion Starter #11
Thats because ALL manufacturers figures are achieved on a rolling road
They bear no resemblence whatsover to real driving.
Its only to appease regulation requirements
I'm sorry but I don't subscribe to the "everybody know's the figures are rubbish school."
I've been driving for 33 years now (3 diesels and lots of petrol) and have managed to get near most quoted figures. I now that the figures are obtained in an artificial environment, but they usually bear some resemblance to reality.
I really like the car and am still not too concerned with the MPG, just seems a shame that by quoting such figures it spoils people's perception of the car.
 
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