Miles per gallon ? - MG-Rover.org Forums
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post #1 of 42 (permalink) Old 20-05-2006, 13:29 Thread Starter
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Smile Miles per gallon ?

My Rover 75 is an 2004 model cdti 131 AUTOMATIC estate car an the economy round town is dreadful, goingto my office in central London (traffic) I get about 19mpg ,my previous car a Volvo 3litre 24 valve estate managed 16.8 mpg!so 19 mpg diesel is not great . The faster I go on a motorway it seems the economy improves and I get about 35 mpg . It never ever averages over 40 mpg whatever I do .Does not leak and no black smoke ,new map sensor might have put up the mpg by a fraction but not much answers on a postcard please ! David Munson
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post #2 of 42 (permalink) Old 20-05-2006, 13:32
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Moved to the 75 and ZT forum where you might get more of a response

Regards

Mike
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post #3 of 42 (permalink) Old 20-05-2006, 13:58
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I have a similar car, although a cdt, not the 'i'. The fuel consumption does vary a lot. Its the town traffic that does it. On motorways, according to the display, at 60 - 70 it shows about 45mg or higher, (that is setting the display at that speed and not counting accelerating up to it etc). I have just done about 240 miles, mainly A roads and dual carriagways, and about 20 miles round town (but not central London) and my dash display is showing 37.9mpg.
On long motorway runs I have had it average over 40mpg. It think it depends when you reset the display the period it calculates over.
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post #4 of 42 (permalink) Old 20-05-2006, 16:11
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Quote:
Originally Posted by mechanic
My Rover 75 is an 2004 model cdti 131 AUTOMATIC estate car an the economy round town is dreadful, goingto my office in central London (traffic) I get about 19mpg ,my previous car a Volvo 3litre 24 valve estate managed 16.8 mpg!so 19 mpg diesel is not great . The faster I go on a motorway it seems the economy improves and I get about 35 mpg . It never ever averages over 40 mpg whatever I do .Does not leak and no black smoke ,new map sensor might have put up the mpg by a fraction but not much answers on a postcard please ! David Munson
Wow! I'm managing to average not far off that with the 4.6L V8 in my ZT-T 260! That can't be normal.. I assume you have tried calculating it manually on a fill up to make sure it's not some sort of problem on the trip computer?
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post #5 of 42 (permalink) Old 20-05-2006, 16:43
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I have just filled up after 240 miles in mine, first time in ages. Most of journey has been to and from work, 3 miles in total. My average was 24 with an average speed of 18 mph. I always have the air con on auto so that wont help. I have just driven 12 mile since fill up and its average is 36mpg. On a 700 mile run last year I averaged 44 mpg and I wasnt hanging about. Looks like on short cold journeys it just eats the bloody stuff!!!!
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post #6 of 42 (permalink) Old 20-05-2006, 17:50
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I've got a 2002 cdt auto with 123,000 on clock.
I've travelled 2,930 miles since picking the car up, mixture of roads and some long, some short journeys.
Average mpg (actually miles v. litres of fuel put in) is 44.

I'm happy with that!
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post #7 of 42 (permalink) Old 20-05-2006, 18:25
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Quote:
Originally Posted by paulmariner
I've got a 2002 cdt auto with 123,000 on clock.
I've travelled 2,930 miles since picking the car up, mixture of roads and some long, some short journeys.
Average mpg (actually miles v. litres of fuel put in) is 44.

I'm happy with that!
So would I be
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post #8 of 42 (permalink) Old 20-05-2006, 18:34
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I have the ZT equivalent, a ZT CDTi 135 + Auto, and up until the crash, I was averaging 31.76mpg. This is an average since i bought the car just over a year ago. Most of my journeys are around town or on single carriageway A roads.

The best I have ever had was 40.66mpg and the worst 26.34mpg.

It sounds as though something is amiss.

By the way, these are actual figures calculated from miles & litres. And I also the tuning box fitted resulting in around 150-160bhp.

Last edited by Ian; 20-05-2006 at 18:40.
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post #9 of 42 (permalink) Old 20-05-2006, 21:19
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my 2004 cdti did ann average of 52 mpg on a 200 mile motorway run with cruise set to 75mph all the way. this is on the mpg display though so may not be 100% accurate.
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post #10 of 42 (permalink) Old 20-05-2006, 21:28
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My diesel tourer averages 30.2 with average speed of 16 mph according to trip computer for normal driving. On 500 miles around Wales did 48.6 average
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post #11 of 42 (permalink) Old 21-05-2006, 01:52
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I had the same engine in a B*W 320d auto. Never got more than 30 mpg. Hence the switch to a manual ZT 190.
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post #12 of 42 (permalink) Old 21-05-2006, 07:40
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I have a CDTi Auto too and the worst I have seen is around 21 mpg from lots of 2 mile journeys to and from work on a cold engine with lots of traffic lights.

I have noticed that I get a better mpg if I drive a little more like a BMW owner, ie. a bit more enthusiastically.

Now that the weather is a little warmer I seem to be averaging around 26 mpg on the same route to and from work.

On my run down to Hampshire next week I am expecting aroung 45 mpg.

As I have said before I see no reason to replace my 75 with another CDTi, I shall instead return to a V6 motor, although it will have to be another auto.
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post #13 of 42 (permalink) Old 21-05-2006, 08:01
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Quote:
Originally Posted by paulmariner
I've got a 2002 cdt auto with 123,000 on clock.
I've travelled 2,930 miles since picking the car up, mixture of roads and some long, some short journeys.
Average mpg (actually miles v. litres of fuel put in) is 44.

I'm happy with that!

I agree. I have the same car and get the same mpg although on really long runs slighlty more.
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post #14 of 42 (permalink) Old 21-05-2006, 08:34
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OK, a few things to check!

1. Check the air filter is clean - this has a big effect and the 30k service interval is too long.

2. Switch the air con OFF (ECON), this makes 2 or 3 MPG difference.

3. Change oil to MOBIL 1 - this helps.

4. Make sure the MAF is working correctly.

5. Check the EGR valve is clean.

6. Check the tyre pressures are correct.

7. Use BP or Shell fuel - NOT Supermarket stuff.

8. Use Millers Pro Plus diesel additive in your fuel.

9. Try not to do short trips!!!!!


All of these tips will help improve the MPG. I average 41-43MPG in my CDTi with 160BHP and have seen 46+. The worst ever is 37.
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post #15 of 42 (permalink) Old 21-05-2006, 09:16
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Remember you get about 20% less mpg with the autobox.
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post #16 of 42 (permalink) Old 21-05-2006, 13:18
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Talking Mpg

My 75 CDTi Tourer Auto averages around 38 MPG (based on fill ups). I normally have it on cruise at 75/80 MPH and probably 80% of my mileage is motorway.
On the computer, consumption seems not to vary much whether at 70,80 or 90 MPH ! I would like the better consumption of a manual but will never tire of the effortless driving my auto gives me.
By the way, I think auto drivers ought to be allowed to have a sandwhich when driving 'cuz they don't have to take their hand off the wheel ! ! ! Can we have a vote ! ! !
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post #17 of 42 (permalink) Old 21-05-2006, 13:54
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Talking

oi oi

my zs 120+ gets 180 mpg.....................on lpg, lol

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post #18 of 42 (permalink) Old 21-05-2006, 17:12
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Quote:
Originally Posted by crofts
My 75 CDTi Tourer Auto averages around 38 MPG (based on fill ups). I normally have it on cruise at 75/80 MPH and probably 80% of my mileage is motorway.
On the computer, consumption seems not to vary much whether at 70,80 or 90 MPH ! I would like the better consumption of a manual but will never tire of the effortless driving my auto gives me.
By the way, I think auto drivers ought to be allowed to have a sandwhich when driving 'cuz they don't have to take their hand off the wheel ! ! ! Can we have a vote ! ! !
A sandwich?
With an auto box and cruise control, I think a nap would be more appropriate for me.
Ron
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post #19 of 42 (permalink) Old 21-05-2006, 23:10
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That does sound low. My 1.8T Tourer manual averages 26 mpg around town (ave speed 18 mph) and I've have just done a 100+ mile motorway run, ave speed 55, fully laden and got 39.2 mpg! The best thing I've found to improve my fuel consumption is to drive about with three babies in the back! (Not very practical I know, but you're welcome to borrow my three to see if it works)
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post #20 of 42 (permalink) Old 22-05-2006, 07:59
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Quote:
Originally Posted by iga
That does sound low. My 1.8T Tourer manual averages 26 mpg around town (ave speed 18 mph) and I've have just done a 100+ mile motorway run, ave speed 55, fully laden and got 39.2 mpg! The best thing I've found to improve my fuel consumption is to drive about with three babies in the back! (Not very practical I know, but you're welcome to borrow my three to see if it works)
Three babies !!?
Blimey, I imagine MPG is the last of your worries at the moment anyway!
Good luck.
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