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Poor Mpg Since 2Nd Service Service


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#1 Hallcross

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Posted 01 November 2011 - 07:55 PM

Ford Focus 1.6 TDCi registered Feb 2009. Mileage 20K
I have had the car since February this year and have always averaged around 55 mpg in town and 58mpg on a run
I have just had a 2nd service done 3 weeks ago and the mpg seems to be affected since then.
Lucky to average 46 mpg in town and 50mpg on a run, what could have gone wrong please?
Car appears to be running fine, brakes not binding etc.
Apologies if this has been asked before, I have tried searching the forum etc, thanks

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#2 artscot79

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Posted 01 November 2011 - 08:34 PM

Ford Focus 1.6 TDCi registered Feb 2009. Mileage 20K
I have had the car since February this year and have always averaged around 55 mpg in town and 58mpg on a run
I have just had a 2nd service done 3 weeks ago and the mpg seems to be affected since then.
Lucky to average 46 mpg in town and 50mpg on a run, what could have gone wrong please?
Car appears to be running fine, brakes not binding etc.
Apologies if this has been asked before, I have tried searching the forum etc, thanks


ide say given the weathers got colder in the last 3 weeks thats likely the answer

#3 rob+

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Posted 01 November 2011 - 09:41 PM

hopefully they've not put 10/40 in :P

#4 Hallcross

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Posted 01 November 2011 - 09:48 PM

ide say given the weathers got colder in the last 3 weeks thats likely the answer

Still been 16 deg here 61f thanks

#5 Richiemac

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Posted 02 November 2011 - 10:48 AM

I'm only getting 450 miles to a tank on a 1.8tdci 2008, is this normal ? Driving is 60% motorway / 40% b road.......thought i'd get better to be honest. Only bought from a dealer 3 weeks ago with 33K miles on the clock. Maybe i expected too much ?

#6 Barry_

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Posted 02 November 2011 - 11:27 AM

I'm only getting 450 miles to a tank on a 1.8tdci 2008, is this normal ? Driving is 60% motorway / 40% b road.......thought i'd get better to be honest. Only bought from a dealer 3 weeks ago with 33K miles on the clock. Maybe i expected too much ?


I would say no. Least i got out a tank is 500 miles so far and thats after pushing it alot. Not had my motor long but i expect to get about 550 out of a tank according to the on board dash and fill up after the fuel light comes on. Do about the same as you 60% motorway and 40% B roads and local roads etc.

I don't watch the MPG figures anymore - just work out the miles per tank by checking miles left and done. You should reset the MPG figure on the motorway and watch it as you drive. Its surprising how the figure only rises when your foot is just touching the pedal.. push it like 2mm further with no noticable increase in speed and the figure tumbles LOL. There seems to be a sweet spot. I can get the MPG increasing crusing at 80 but at the same time tumble at 60 coz the pedal is that tiny tiny bit further pressed.

#7 Chutney

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Posted 02 November 2011 - 11:48 AM

That'll be down to the algorithm written to calculate the MPG figure, rather than an actual calculation based on exact fuel consumption.

The car probably has all the tech to produce exact figures, but would probably be too much of a load on the ECU to extract that data and calculate it for the drivers use.

Best way is to do half a dozen tanks (with manual calculations) and then compare real to calculated figures and see how it stands up. Based on previous cars and also generic OBDII devices for measuring MPG, the calculated figures could be anywhere up to 10% out.

If I can manage 500 miles to a tank out of mine I will be happy, my current car does approximately 600miles to a tank, but has a 65L tank and I am happy with that.

Don't set yourself unrealistic expectations, as real-world MPG is normally way off manufacturer / VOSA figures, due in part to the nature of roads we use everyday versus an empty, smooth test track where the tester can use their judgement to get the best they can out of the car.


And don't ever forget... Using your brakes is the most expensive bit of driving you can ever do.

#8 Richiemac

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Posted 02 November 2011 - 12:32 PM

Correct in saying the computer is useless, i figured that out already so i work it out in miles for money. Last 2 fills were 450 / tank (light on to light on) Something not right somewhere i think.

#9 Barry_

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Posted 02 November 2011 - 03:02 PM

About 50 miles short compaired to mine. May just needs a little service - Air & fuel filter?? Maybe some BG244?? (just guessing - could just be your driving LOL)

"If I can manage 500 miles to a tank out of mine I will be happy"... I bloodly wouldn't!!!! Can't see that you would be either if your motor suddenly lost 100 miles a tank LOL. How come your tank is 65Litres??? The focus has a 53 litre fuel tank??

#10 Chutney

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Posted 02 November 2011 - 07:18 PM

Because the current car is a VW Passat 1.9 TDi which I currently get 600miles out of a tank (to light coming on), so with a tank approximately 10litres smaller, then 500 miles to the same point (light coming on) and I will be happy.

Yes losing 50 miles to a tank is disappointing, but not horrific.

#11 Barry_

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Posted 02 November 2011 - 07:41 PM

LOL that explains that then - though you were on about the Focus 1.6TDCi Style in your details :)

Still 500 miles is a tad low imho

#12 artscot79

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Posted 02 November 2011 - 08:20 PM

LOL that explains that then - though you were on about the Focus 1.6TDCi Style in your details :)

Still 500 miles is a tad low imho


as i was saying on another post ive done brim tests and worked out mpg and its higher than the on board computers thats a mk2 granted but its probably under the skin the same chips running the show so the computer may well be wrong it is as ford say just a guide and does not represent actual figures...................wish my bank account worked the same way lol :D

#13 Barry_

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Posted 03 November 2011 - 09:47 AM

as i was saying on another post ive done brim tests and worked out mpg and its higher than the on board computers thats a mk2 granted but its probably under the skin the same chips running the show so the computer may well be wrong it is as ford say just a guide and does not represent actual figures...................wish my bank account worked the same way lol :D


Completely agree with you mate. Thats why we are comparing the actually total miles out of a tank between fill ups rather than the MPG figures ;) That can't be wrong.

I might do a brim test myself, but to fair i can't be bothered lol!! At least yours worked out more than the onboard figure

#14 gary29428

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Posted 03 November 2011 - 10:29 AM

Would needing a fuel filter change cost you when it comes to MPG, how often should I be changing it on a 2009 1.8tdci.

#15 artscot79

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Posted 03 November 2011 - 01:04 PM

Would needing a fuel filter change cost you when it comes to MPG, how often should I be changing it on a 2009 1.8tdci.


i cant say last diesel i owned i changed the filter every 2 years if the filter was blocked youde have hesitation when accelerating etc as for mpg it would be very minimal to be honest youde save more mpg checking tyre pressures weekly and changing the oil and filter every 6 months to a year

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