Rubbish fuel Economy (or not)???

steve5250 · Mar 26, 2013

I get 31mpg from my 300 tdi manual, on a run from south wales to scotland with a 5'x3' trainer behind.

Usually about 27/28 for normal driving.

Egr and cat less, 80/20 road tyres 32psi front 36 psi rears.

auf_wiedersehen_pet · Mar 26, 2013

Paulmitchell1984 said:
if 33's alter your speed by 10% so 30mph on clock is 33 on gps then would the fuel be altered by 10% too, so 400 from tank is 440?

Yep. Bigger tyres rotate less so your speedo and odo will be low. This needs to be factored in to get a true mpg.

Paulmitchell1984 · Mar 26, 2013

auf_wiedersehen_pet said:
Yep. Bigger tyres rotate less so your speedo and odo will be low. This needs to be factored in to get a true mpg.

thought as much, upto 336 so far with about 1/4 tank left so seems my mpg hasnt altered much with bigger tyres either, but mainly been big motor way runs not piddly little shop runs.

discool · Mar 26, 2013

auf_wiedersehen_pet said:
That's 78 litres per hour or £106 per hour. :screaming_bug_eye_f :screaming_bug_eye_f :screaming_bug_eye_f :screaming_bug_eye_f

Or £1.76 per minute so not so bad, as u can go a long way in a couple of minutes at 155mph

Now days I put in over £100 every four or so hours when I go on a long road trip

auf_wiedersehen_pet · Mar 27, 2013

discool said:
u can go a long way in a couple of minutes at 155mph

In my "youth" I once crossed Belgium without dropping below 150mph - on a Kawasaki ZZ-R 1100.

seanlandy · Mar 27, 2013

My auto seems to do about low 20's mpg which isn't great I agree. I wonder whether when I tweak the diesel pump it will improve. Probably not although it may just be a bit more fun to drive....or not. Thank god I have a Toyota Aygo as my daily run!!

xat44 · Mar 27, 2013

auf_wiedersehen_pet said:
In my "youth" I once crossed Belgium without dropping below 150mph - on a Kawasaki ZZ-R 1100.

zzr1100. what a bike. had mine since 2000 and still love it.
actually off to belgium next month on it, for a bsa rally.

back on topic. my auto does about 23mpg on local trips.

thebiglad · Mar 27, 2013

My last TDi 300 auto a 1998 model achieved 33mpg on average over 16,000mls of ownership. This included a trip to the Sahara, day to day running and motorway trips.

She was serviced to within an inch of her life, tyre pressures checked regularly - 33 front, 38rear - de-EGR'd, de-Catted, std road tyres.

My first Disco, a '93 TDi 200 gave 36mpg on day to day running, 40 on a run and a best-ever 46mpg !!!!!

Dave

discool · Mar 27, 2013

auf_wiedersehen_pet said:
In my "youth" I once crossed Belgium without dropping below 150mph - on a Kawasaki ZZ-R 1100.

In my Yoof I had a Tiger100 which may have seen 80mph a lot slower than my mates Norton 650 SS 120mph and with me on the back, thats when we wasn't kicking hell out of the Mods.

Now lets go :focus:

thebiglad · Mar 27, 2013

I'll get my RAF greatcoat, SX 200 with sheepskin backrest, tank aerial and 16 mirrors then.

thebiglad · Mar 27, 2013

Kmadsen68 said:
I have recently bought a 1995 Disco ES Auto 5-door and is thrilled about it. It drives very smooth and I love the simplicity of the car

However, I read in the manual that the fuel economy at 55mph should be around 36mpg.

I am not doing anything close to that. And that is eventhough my daily drive is 30 miles to work and 30 miles back on dual carriage roads and A roads. I have one roundabout and one traffic light, otherwise it is straight forward driving. I do not have a heavy foot at all and try to drive economical but I am still only averaging about 23mpg - that seems a far cry from 36mpg.

Has anyone else had a similar experience or is there something I need to check on the car? (Tire pressure is ok and tires are ok).

Thx for any pointers,

Kenneth

Hi Kenneth, here are a few pointers for improving your mpg:

1. Cruising speed max 60mph;

2. Tyre pressures 33 front 36 (or more) rear;

3. Check that none of the brakes (inc the handbrake) are dragging;

4. Put in a new air filter;

5. Give the car a thorough service, all oils and filters;

6.Clean out the fuel sedimenter.

7. Grease the prop u/j's.

You're looking to do anything and everything to reduce drag and improve efficiency.

Good luck

Dave

discool · Mar 27, 2013

thebiglad said:
I'll get my RAF greatcoat, SX 200 with sheepskin backrest, tank aerial and 16 mirrors then.

:hysterically_laughi

GT200 in my day IIRC and believe it or not I liked them, and I rode one once or twice.

seanlandy · Mar 27, 2013

xat44 said:
zzr1100. what a bike. had mine since 2000 and still love it.
actually off to belgium next month on it, for a bsa rally.
back on topic. my auto does about 23mpg on local trips.

Sold my ZZR for a Blackbird...great bike!!

Kmadsen68 · Apr 3, 2013

The manual in the glove compartment states 36 mpg at 55 mph... And I am getting nowhere near this kind of mileage...

Kmadsen68 · Apr 3, 2013

thebiglad said:
Hi Kenneth, here are a few pointers for improving your mpg:

1. Cruising speed max 60mph;

2. Tyre pressures 33 front 36 (or more) rear;

3. Check that none of the brakes (inc the handbrake) are dragging;

4. Put in a new air filter;

5. Give the car a thorough service, all oils and filters;

6.Clean out the fuel sedimenter.

7. Grease the prop u/j's.

You're looking to do anything and everything to reduce drag and improve efficiency.

Good luck

Dave

Hi Dave,
Thanks for all the pointers. Have just changed oil, diesel and air filter, as well as the oil and done the tires - still same mpg :-(
Have not cleaned out the fuel sedimenter nor greased the prop u/j's. Will have a good with these over the weekend.
Kenneth

Dippypud · Apr 3, 2013

We managed to get 32.7 MPG over the 500 miles of our trip up Norf -

to Barnoldswick then across to Skipton, down to Selby - overnight there and back home to London ...

all in a 300TDi manual 98 Disco - normal driving style

If yours is an auto box it'll make a big difference

cambridgecockney · Apr 4, 2013

Or as swmbo says.mpg, it does what it does, its a brick on wheels with the aerodynamics of a house.

Sheffield · Apr 4, 2013

We have a manual 200 and an auto 300 with edc. In ordinary use the auto seems to do worse than the manual, but on a long motorway run at a steady 55-60 it does better than the manual gearbox one. Usually in the mid 20s, but I have had 35mpg on a good run.

Rubbish fuel Economy (or not)???

steve5250

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auf_wiedersehen_pet

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Paulmitchell1984

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discool

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auf_wiedersehen_pet

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seanlandy

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xat44

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thebiglad

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discool

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thebiglad

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thebiglad

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discool

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Dippypud

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Sheffield

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