Fuel Consumption

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SamWise
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Fuel Consumption

Post by SamWise »

I'm driving a 2.1 XM at the moment, and loving it. It's big, and comfortable, and it gets me about 50 mpg on the long motorway runs I have to do. I'd wanted an estate, but I've got a hatch, and I can't help thinking that a BX hatch, if it had leather (my XM does) would be even better - that bit smaller and more personal. I could replace the XM with either an XM or CX estate for the heavy duties and big holidays, and use the BX day to day. Thing is, I'm wondering what sort of mileage I could get? Realistically, a BX which would live up to my XM would cost money (not tons, but a top spec TD with leather isn't going to be £300), so it'd need, really, to get me BETTER mileage than the XM to be worth pursuing. What do you guys know about the TD's economy?
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cavmad
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Post by cavmad »

Hard to pinpoint exact figures because each one will be different. I've had TZDs that atruggled to get around 40mpg and yet had others that would crack 50-55(ish) without too much bother. I suppose it depends how much you need or want the performance: I found the 1.9 n/a to be very good on fuel and a 1.7 n/a the best of all by a country mile. I could get well over 60mpg in the 1.7 without trying and it wasn't quite as slow as some would have you believe.
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Terry Brooks
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Post by Terry Brooks »

I usually get around 100 miles per £10 out of my TZD ...............I got a shock this week ........£45 for 400 miles ..........I dunno wot that works out at ...........tbh,I just put the stuff in the tank and run the car [and I very seldom actually notice/clock the prices,I just pay up ...........& fill up] ......and I usually thrash the b*ll*x off it.
And an old tzd will run with cooking oil added to the deisel .......£2.20 per 3litre bottle at Morrisons :wink:.
hth
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docchevron
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Post by docchevron »

They all vary as Billy said.
Mine is tuned to hell and back, but if it's driven carefully I can get 62MPG without dawdling too much.
However, on a track day I can get it down into the mid thirties..

Alot depends on driving style and what condition the engine is in.
The 2.1TD XM is the best of the XM's, I love them, but the breaks look horrid, the berline is gorgeous.
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Post by SamWise »

I used to have an NA BX - can't remember whether it was 1.9 or 1.7 though. With one of those, you really really don't get any toys though, do you? I'm not going to turn up a 1.7 NA diesel with aircon, electric windows and leather..... (though I suppose I could move the leather across from something else).
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kermit the frog
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Post by kermit the frog »

My BX 17 TZD which is in dry( nearly dry ) dock at the moment regularly got 55 to 60 mpg no problems
Hoping that when i get her up and running again she will still do that
Fitted new air filter oil filter and fuel filter last weekend (left the oil draining for 24 hours)
Drained and cleaned out the LHM tank washed out the filters and dismantled the float switch cleaned everything.
Put it all back together and she starts and runs like a dream.
Just two front flexy brake hoses to do and refit the front wings and bumper. :roll: (will i ever get it finished)

YES!!!!!!!!!!.

Regards Kermit :) :)
PS saw a lovely clean XM TD yesterday in Shoreham while comming out of the hospital VERY NICE i see why you like the leather this one had it too!
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MULLEY
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Post by MULLEY »

Best i managed in the Gti was 36mpg, worst probably mid 20's.

TZD Turbo, averaged 45mpg, worst about 35mpg, which i only realised when driving along, the car started spluttering, managed to make it to petrol station & then i put in 65.5 litres into a 66 litre tank :shock: . Clearly the amber low fueling light doesnt work :lol:

TXD, averages close to 50mpg, worst must be low 40's with that shite bio-diesel in the tank.

I'm impressed by others fuel economy, anyone who can regularly get over 50mpg must either drive slowly, lives in a flat part of the country or doesnt do much mixed driving including getting stuck in traffic or has some skill that i'm unaware of :lol:

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DavidRutherford
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Post by DavidRutherford »

The driver's style of driving has a big effect on fuel consumption, but the type of driving does too. Where I live the majority of driving is on winding country roads, or fast dual carriageways. Consequently, my fuel consumption is always going to be lower than if I was driving on 30/40mph roads a lot of the time, especially as I tend to drive my vehicles fairly hard. I usually get just over 45mpg out of my DTRturbo, but I'm sure 50 woudln't be too hard to achieve.

The other thing that can be paramount to diesel fuel economy is having the injection timing correct. One of my old 405 TD's used to struggle to achieve 40mpg, no matter how gently I drove it, and would regularly be in the mid 30's. After setting the injection timing (it was only slightly out) that jumped to mid 40's, with 50 being achievable. The car felt exactly the same, with just as much power available, just a 10mpg difference!

50mpg out of an XM though is fairly impressive, so I would guess that your engine is set up perfectly, your driving style is ideal and the roads you drive on permit economical motoring. If you can get that out of a 2.1TD XM, you should be able to get 55mpg out of a BX TD with relative ease.

I have to say, unless you're doing most of your mileage in town, I'd avoid the naturally-aspirated diesels. By modern standards they are underpowered, and the only reason they are more economic is because you have less power to play with. In theory, at a constant speed, a TD engine is slightly more efficient than a N/A one, and hence marginally more economic, but of course in reality that never happens as you tend to use the available power.

Leather in a BX is another matter. Like A/C, it was a cost-option on certain models only, and so is now very rare indeed. I've only ever heard of about half-a-dozen sets of leather seats. In fact, I've heard of more vehicles with A/C than I have with leather, and A/C cars aren't exactly thick on the ground.
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SamWise
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Post by SamWise »

I should be clear. I can get 50 mpg on the motorway, driving gently. I don't get 50 in my XM average, and I don't get anywhere near it in town. Most of my fuel money gets spent hurtling round the motorway system though, so that's what's important to me. I'm really not that much of a "user of power", either. I get up to 70, and I stay there - I rarely overtake on single carriageway roads, and I don't sprint away from lights either. So, theoretically, a 1.7 TZD is more economic than an NA? In order to be my perfect personal Citroen though, it'd have to have the leather, somehow, from somewhere...... And be black, really.
1966 Triumph Herald convertible with big valve twin carb Spitfire head

1973 Bedford Panorama Elite II Bus

1994 2.1TD Citroen XM

1992 Citroen AX Echo 1.4D

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DavidRutherford
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Post by DavidRutherford »

SamWise wrote:So, theoretically, a 1.7 TZD is more economic than an NA?
It has the potential to be more economic than a 1.9D, but it also has the potential to use more fuel if you drive it hard.

A 1.9D will use less fuel even if driven hard, but if you had two otherwise identical BX, traveling down the same motorway at the same speed, with the same headwind and the same everything else, the 1.7TD will use slightly less fuel.

The TD model will also be more relaxing to drive as it has a higher differential ratio, so the engine is revving less than the NA model. This will also assist the fuel consumption a bit, but the turbocharger has more of an effect.
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MULLEY
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Post by MULLEY »

David, is the timing something that anyone can do, or is it best done by a garage as they would have the necessary equipment?

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docchevron
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Post by docchevron »

To set the pump timing you'll need a GOOD dial guage, and thats about it.
It's not specially difficult to do, but if you're not sure what you're doing the potential to bu&&er it up is quite high, and diesel injection specialists dont charge much to set the timing..
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Post by ken newbold »

Been to Cheltenham and back today in the TZD, and to be honest very disappointed in the fuel return. Only seems to have done about 50mpg despite driving it gently. I know I would have achieved that much in the XM.

No BX's in sight. But in Cheltenham did see one XM estate and an Austin Maxi s reg :o
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Post by Terry »

My 1.9 TXD estate consistently returns 60-62 mpg, not that I do the figures every week, I most certainly don't, but the price of fuel now it's worth keeping an eye on the situation.

Most of the motoring I do is, like David, around winding country lanes here in Suffolk - not so much breaking through the gears, more dabbing brakes in an attempt to keep the revs up. Speed is not possible - and at this time of most years just getting from A to B is a cause for gratitude.

I've checked the TXD - bought from Phillip early last 'summer,' - on longer runs down the A11 & M11, and it's much the same. Fully loaded or not, the return is just the same.

Ten years ago I took a TZD saloon to Czech Republic, did 5000 miles and came back and the average was 58 mpg - not bad at all since the out and return journeys were done mostly in excess of 100 mph!! A bit galling when I filled up at 65p per litre in Swaffham, and on arriving in Czech saw the same brand at 16p a litre. Hard to believe, but true. I have a photograph somewhere of the gas station.

I too have an XM saloon, a 2.0l turbo which has been gas converted. Its a disatser!!! on a good day trip we might get 30mpg which is worse than the Landrover Disco my wife drives. Mercifully the TXD replaced the XM, which has been up for sale for months.

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Post by MULLEY »

30mpg @ 60p/l doesnt sound poor to me? or has lpg gone up in price?