Very poor mpg at 21.5 mpg

Zeb246 · Dec 13th, 2012, 16:28

I'm getting very poor mpg on my D5, whether I'm doing short journeys or long journeys. I'm averaging about 21.5 mpg or at most 21.8 mpg.

What's the reason behind this?
What's the best additive to buy?
How much are you averaging?

scooby · Dec 14th, 2012, 14:31

that is a bad mpg i get 43 to 40 out my d5

Zeb246 · Dec 14th, 2012, 21:47

I think it needs a full tank of Shell fuel, and millers additive. That should do the trick.

halfamp · Dec 15th, 2012, 00:04

Quote:

Originally Posted by Zeb246

I think it needs a full tank of Shell fuel, and millers additive. That should do the trick.

if only life was that simple!

Zeb246 · Dec 15th, 2012, 00:09

Quote:

Originally Posted by halfamp

if only life was that simple!

I agree with you there. From what i think the previous owner has not taken the car on the motorway, so it could be that the engine has not been opened up, as it's only done 43K miles. Might take the car on a long trip, and see if i could get the mpg up to 40mpg.

Which fuel do you use, and what additive do you use?

nbuuifx · Dec 15th, 2012, 14:44

When was the last MOT? What were the emissions like?

Try plugging in an OBDII reader to see if you have a fault code listed

Zeb246 · Dec 15th, 2012, 17:24

I don't have the copy of the emissions test. Same thing happened today, reseted the mpg to 0.00 took it for a normal test drive, and the mpg went up by 25.8 mpg. That is still very poor, can't get my head around on what's causing the problem.

Does the fuel filter need changing?

Zeb246 · Dec 20th, 2012, 15:34

Parkers have stated I should get 45mpg..
http://www.parkers.co.uk/cars/review...on-2004/43752/

rowdy · Dec 20th, 2012, 17:40

No amount of fuel additive is going to cure your problem.

Is your oil level rising?
Have you checked around the injectors for fuel leak?

Are you going by the trip computer for your mpg figures?
If so it might be an idea to fill the tank and reset your odometer and fill it back up after you have covered 50 miles. Then work out how much this 50 miles has cost you and see how many litres of fuel it has used, then convert it into miles per gallon. Just a thought, but it may even be your info centre reading wrong.

850Chris · Dec 20th, 2012, 17:52

Just a thought but have you considered low consumption could be due to binding brakes?

Do you have any signs of this - discs hot after a run (but without having done hard braking), pulling to one side etc...etc...?

Dec 13th, 2012, 16:28	#1
Zeb246 Senior Member Last Online: Jun 9th, 2013 13:19 Join Date: Jul 2012 Location: Bristol	Very poor mpg at 21.5 mpg I'm getting very poor mpg on my D5, whether I'm doing short journeys or long journeys. I'm averaging about 21.5 mpg or at most 21.8 mpg. What's the reason behind this? What's the best additive to buy? How much are you averaging?

Dec 20th, 2012, 15:34	#8
Zeb246 Senior Member Last Online: Jun 9th, 2013 13:19 Join Date: Jul 2012 Location: Bristol	Parkers have stated I should get 45mpg.. http://www.parkers.co.uk/cars/review...on-2004/43752/ Last edited by Zeb246; Dec 20th, 2012 at 15:43.

Dec 20th, 2012, 17:52	#10
850Chris Premier Member Last Online: Aug 16th, 2017 20:12 Join Date: Aug 2006 Location: Fife (Scotland)	Just a thought but have you considered low consumption could be due to binding brakes? Do you have any signs of this - discs hot after a run (but without having done hard braking), pulling to one side etc...etc...? __________________ 2004 V50 T5 SE Manual Now sold, off to BMW land for a while. Last edited by 850Chris; Dec 20th, 2012 at 17:54.

Dec 14th, 2012, 14:31	#2
scooby Member Last Online: Aug 9th, 2022 19:36 Join Date: Nov 2009 Location: birmingham	that is a bad mpg i get 43 to 40 out my d5

Dec 14th, 2012, 21:47	#3
Zeb246 Senior Member Last Online: Jun 9th, 2013 13:19 Join Date: Jul 2012 Location: Bristol	I think it needs a full tank of Shell fuel, and millers additive. That should do the trick.

Dec 15th, 2012, 14:44	#6
nbuuifx Senior Member Last Online: May 1st, 2015 23:01 Join Date: Dec 2011 Location: Staffs	When was the last MOT? What were the emissions like? Try plugging in an OBDII reader to see if you have a fault code listed

Dec 15th, 2012, 17:24	#7
Zeb246 Senior Member Last Online: Jun 9th, 2013 13:19 Join Date: Jul 2012 Location: Bristol	I don't have the copy of the emissions test. Same thing happened today, reseted the mpg to 0.00 took it for a normal test drive, and the mpg went up by 25.8 mpg. That is still very poor, can't get my head around on what's causing the problem. Does the fuel filter need changing?

Dec 20th, 2012, 17:40	#9
rowdy Senior Member Last Online: Jan 10th, 2024 06:10 Join Date: Jan 2010 Location: West Sussex	No amount of fuel additive is going to cure your problem. Is your oil level rising? Have you checked around the injectors for fuel leak? Are you going by the trip computer for your mpg figures? If so it might be an idea to fill the tank and reset your odometer and fill it back up after you have covered 50 miles. Then work out how much this 50 miles has cost you and see how many litres of fuel it has used, then convert it into miles per gallon. Just a thought, but it may even be your info centre reading wrong.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)