CDTI MPG

Hi all
I have a new shape Zafira CDTI 150 auto. I can only get 35mpg out of it
however I drive - I was expecting better. Can anyone tell me if they get
any more mpg with the CDTI 150 engine? any car will do not just zafira -
Im just looking for a ball park mpg I should acheive or if mine needs
looking at.

cheers
bob

 

Hi Bob

I have Vectra CDTi 150 and get around 48 MPG. This is doing approx 1000
motorway miles per week. It is a manual which also helps with the MPG.

Sean

 

I had a Signum CDTI 150 manual for 2 years and 60,000 miles. Never got
less than 45 mpg and on a long motorway run just over 50 mpg.
Moved like s**t off a shovel when the turbo kicked in!

I suppose the Zafira is a little less aerodynamic and you would lose
some mpg with the auto, but 35 mpg does seem a little low.

Harry

 

The figures on Parkers say 45/46 for the manual and 39 for the auto. Are
the tyres at the right pressure, and do the filters need replacing? (I got
new tyres on my Signum - the garage pumped them up to 30psi - lost 2mpg! I
put them up to 35psi like the manual says, and got the mpg back).

Bob

 

Looks like you're not the only one:-

http://www.honestjohn.co.uk/forum/post/index.htm?f=4&t=49562

 

Funny you should say that about the filters - I only recently bought the car
with 12k on it from a Network Q dealer. Although the service book has just
been stamped, I have a feeling that they did not carry out any servicing as
the oil was very black on the dip stick, and the the service warning light
comes on - the dealer told me they just forgot to reset it.

Think I'll take it back to and have a moan at them.

Cheers
bob

 

That happens about 5seconds after it goes in....

Hard to belive but try it yourself!

 

Except that one is the 2.0 DTi which has 33% less power. The only
thing it has in common with the 1.9 CDTi is the diesel fuel that goes
in it!

 

Are you sure? I thought the 2.0 used contaminated fuel from Tescos whereas
the 1.9 got its contaminated fuel from Morrisons....

 

They both get the same mpg if you look at the official figures (maybe 1mpg
different).

Bob

 

But the 1.9 CDTi (150) is more powerful than some petrol engines, and
can accommodate very different driving styles to the 2.0 DTi (100)
which will affect MPG. Also any common faults affecting MPG on one
engine would not necessarily be appropriate to the other.
The OP was looking for comments on any car with the same engine.
Although this is a Vauxhall group this could include the Alfa 156 1.9
JTD (16V) or the Saab 9-5 1.9TiD whose engines have more in common
with the OP's car than the 2.0 DTi which from personal experience was
just as economical but couldn't pull you out of bed!

If any reader is ever looking for a decent Vauxhall diesel avoid the
old DTi engines and spend a bit extra for the CDTi which have much
better performance and less servicing intervals (up to 30K).

 

I was just trying to make the point that the engines have virtually the same
mpg. I know the common rail versions can pump more fuel in when requested,
but they are still as economical when cruising, and have a 6 speed box (on
the veccy/siggy at least) - I did think 3000 rpm at 80 was a bit high on
mine, and the 2.0 dti would probably come out 1-2 mpg better than the cdti
if it had a 6 speed box (assuming 6th on the cdti is not the same ratio as
5th on mine).

The Alfa and Saab do have more in common with the OPs engine because they
are the same 1.9 Fiat produced lump.

My 98bhp 2.0 dti signum is no slouch when compared to my last car (136bhp R
reg 2.0 petrol veccy) mainly due to the higher torque and turbo effect on
the dti. I thought it was roughly comparable, and am looking forward to
switching to a 1.9 cdti150 on my next car (probably comparable with my much
missed Astra GSi).

The 1.9cdti is only available on newer models ('04 on the signum), there is
no case of avoiding it if your budget limts you to an '03 model.

The 2.0 dti also has the 30,000 service interval. There was once a maxim of
"diesels are simpler, so last longer", but I would like to know if this is
still true with the more complicated/stressed common rail diesels. (50bhp/L
as opposed to 75bhp/L - look at the service intervals and bhp/L on F1 cars -
a new engine every race!)

Bob