Over the last week the mpg has gradually reduced from 34.7 to 34! I've only had this car a week and a half...sob. Can anyone tell me why it may be doing this? It is a diesel Mondeo. My husband did check the tyre pressures at the weekend.

Minty xx

 

right foot gettin heavier ??

 

maybe it calculated your 34.7 miles on a motorway run and now your round town shopping it is decreasing.

 

Yes maybe that's it. I have done a lot of very slow driving in traffic this week. Also I usually drive in flip flops, but have tried to turn over a new leaf this week and have been wearing trainers. They are heavier to drive in though.

Minty xx

 

34.7 to 34 is a fraction of a change. Going up one hill can make your average mpg on an entire tank (600 miles) drop more than that.

Seeing as you have only had the car a week and a half I would wait until you have driven it a bit more to get more of an idea of what average mpg it will do.

With steady driving though, you should see more than 34 on a diesel... Try driving a bit smoother - accellerate slower and slow down into corners/roundabouts more in advance using engine braking rather than the brake pedal.

On my Laguna diesel I see anywhere from 48mpg to 42mpg average on a tank. It all depends on how you drive, what roads you drive and probably the weather as well

 

i get 34 mpg out of my fiesta si and thats 1.6 si

 

.7 of a mile

 

You're moaning over 0.7 of a mile- jesus fucking wept, no wonder everyone is slitting their wrists thesedays if thats the height of problems

 

ANything can make such a small change. Dont panic. If it was 50mpg to 30mpg over same distance etc then maybe something to worry about. But not that

 

Im doing better than that in our 2.0 petrol mondeo

Getting 38.2mpg out of a full tank

Steve.

 

my 2.2 diesel st mondeo dose 45 to 55 mpg depending how i drive it,never had it below 40 mpg

 

drive it for a while longer than you have, its a new car and you are probably not used to it yet

 

my bm is down to 12mph, i get 17mpg on motorway runs

 

i have an 04 plate mondeo 130 tdci and thats doing 41mpg and thats on the school run............i wouldnt even worry about a .7 fluctuation m8.....i get that if i boot it for a min or 2.

 

L O L

 

my saffs doing 30mpg

 

you must have a closed loop set up then...i get no where near that

 

yes its more like 8mpg if i drive it like a man though

 

is it worth the extra money then?????.....sounds like it is

 

oh yes! best thing i ever did..... going gt30 soon, and on a cruise it will be exactly the same on fuel as it is now

 

sounds like a worthwhile mod.....im getting mine set up soon so it maybe an option 4 me

 

Thanks for your answers. I haven't had a car that shows the mpg before so I thought that a drop of .7 was a lot. It still seems to be very little to the gallon for a newish car though, but maybe it isn't really run in or something yet.

Minty xx

 

is this a wind up 0.7

 

LOL You are not doing much for the women drivers stereotype

Driving in traffic you will not see good mpg - take it for a run somewhere, but reset the counter before you go...

 

 

Look, I know I'm a typical stereoptype kind of female driver, but that doesn't exactly make me a criminal (though I daresay some on here might disagree. ).

I'm just trying to find out a bit more about the car I'm driving, that's all.

Minty xx

 

I can get around that too.

@ 0.7 mpg difference though.
Seriosly though, fill the car to the brim, do your normal driving week, then fill to the brim again and work it out manually. Repeat again, and youll probably find that it'll be pretty consistant for the next few runs. Providing you drive the same of course. Your always going to get a difference of a few mpg though.

 

Okay thanks for that. I shall give it a try. (Btw...it isn't .7 anymore, it's .8 now )

Minty xx

 

0.8 now! Just thought, you have reset the fuel computer when you bought it havnt you? Did you drive it back home a long way on the motorways when you bought it? All this will mean the mpg will drop gradually if your doing town driving. nothing to worry about anyway. Reset it and see what happens from week to week.

 

I didn't think about resetting it. I will do that. Thanks.

Minty xx

 

jesus fucking christ

 

 

If this is a FORD.....

The software in the dash is calculating the average long term.
The more miles you do, the more accurate it will be over the total
distance since it was last reset.
As this figure approaches its internal count of 600 miles or is over that,
the figure will always be the average fuel economy over 600 miles.

Besides 0.7 miles is nothing

 

Oh I seeee. That's very helpful. Thanks very much for the info.

Minty xx

 

0.7 i'd get it into the dealer quick for diagnostics

 

SHE is a BIRD mate

 

Maxest can confirm I am bonafide. He sold me the car.

Minty xx