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is something wrong with my car?

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had my car serviced beginning of last month and since then appears to be using more fuel. just recently over the last few weeks my average mileage has gone down from 33.3 to 32.2. it isnt alot i know … Read More
donna-lou Avatar
6y, 5m agoPosted 6 years, 5 months ago
had my car serviced beginning of last month and since then appears to be using more fuel. just recently over the last few weeks my average mileage has gone down from 33.3 to 32.2. it isnt alot i know but im driving more carefully since realising it was guzzling the fuel. someone told me cars use more fuel after a service and also use more fuel in the colder weather so do i just put it down to this?
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donna-lou Avatar
6y, 5m agoPosted 6 years, 5 months ago
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4 Likes #1
It's broken I'd sell it before the brakes stop working and it crashes into a wall.

Edited By: numptyj on Oct 26, 2010 21:17: .
banned 1 Like #2
check your tyre pressure and empty all the rammel out the boot.
#3
whatsThePoint
Do you drive the same route at the same speed, stopping at the same traffic lights ever time to do exactly 33.3 to every gallon

ive been driving to all the same places since i got it back in february
banned#4
whatsThePoint
Do you drive the same route at the same speed, stopping at the same traffic lights ever time to do exactly 33.3 to every gallon


i was wondering how they worked out this too - lol
#5
slamdunkin
check your tyre pressure and empty all the rammel out the boot.

wont tyre pressures have been checked at the service? also nothing in the boot but a road atlas
#6
cold air is more dense so to keep the air fuel ratio more fuel is needed
#7
take the handbrake off :p
#8
whatsThePoint
mpg should get better after a service not worst,but to counter that cold weather will increase the fuel used as the cloke will be on more when you first start it
so you dont think its anything to worry about?
#9
its a fiesta ST
banned 1 Like #10
1mpg drop jesus this is a troll thread avoid!
#11
lumoruk
1mpg drop jesus this is a troll thread avoid!

not a troll thread at all, i did say i know its not alot. the point is im driving more carefully and the mpg is dropping when if anything it should have risen. if its possible there may be a problem then by finding out earlier rather than later it could save more damage being done and cheaper to solve. youre the one trolling my thread when you have nothing useful to say
banned#12
but how can you possibly know the speeds you travel at for every part of every journey, and time spent in traffic or traffic lights, etc,etc
#13
whatsThePoint
This from AutoExpress"Ford quotes an official combined figure of 38.2mpg, and we returned 25.5mpg"But why buy a performance car if your going to worry about mpg
im not worried about that as such, more the reason it could be dropping. if it is normal to drop after a service and in the cold weather then fine, if not then i know it may be something else
#14
sassie
but how can you possibly know the speeds you travel at for every part of every journey, and time spent in traffic or traffic lights, etc,etc

i dont know for every part. the car has a screen in the dash which tells me the average mpg
banned#15
Stop using this site....your eating to much Ben and Jerry's.....Now go on a diet and watch your consumption
banned#16
donna-lou
sassie
but how can you possibly know the speeds you travel at for every part of every journey, and time spent in traffic or traffic lights, etc,etc


i dont know for every part. the car has a screen in the dash which tells me the average mpg


exactly that only calculates petrol used and miles covered, doesnt calculate speeds, time spent in traffic, etc,etc
banned#17
Have you ran the engine in the morning prior to driving ,in order to defrost the windscreen
#18
slamdunkin
Have you ran the engine in the morning prior to driving ,in order to defrost the windscreen
only once and the mileage was dropping before that. was only for a couple minutes anyway not like it was running for a long time
#19
Natural variation, don't let it bother you. Unless you see a 5+ difference I wouldn't spend time thinking about it.
#20
whatsThePoint
at what rpm do you change gear and how late do you leave the braking when your coming to a stop?
dont know exactly lol but roughly around 3000 id say. no dont leave braking too late, even more so lately with the fuel going down. im definetly driving more sensibly now than before which is why im wondering if somethings wrong
#21
greg_68
Natural variation, don't let it bother you. Unless you see a 5+ difference I wouldn't spend time thinking about it.

thanks. hopefully it wont drop anymore
#22
whatsThePoint
at what rpm do you change gear and how late do you leave the braking when your coming to a stop?


retardation from using the brakes wont consume fuel, if shes engine braking then that will. But ye OP is a bit OTT me thinks.
#23
Same fuel?
1 Like #24
donna-lou
slamdunkin
check your tyre pressure and empty all the rammel out the boot.
wont tyre pressures have been checked at the service? also nothing in the boot but a road atlas

Ah, but when did you put the road atlas in the boot? That could be the culprit :|

whatsThePoint
mpg should get better after a service not worst,but to counter that cold weather will increase the fuel used as the cloke will be on more when you first start it

The cloke? What's that? Is it like a car cover type thing?

Edited By: deek72 on Oct 26, 2010 22:09: /
#25
Ilnf
Same fuel?
well its from the same petrol station, just standard unleaded
#26
Sounds like it's the Nut behind the wheel...
#27
Supermarket petrol station or oil company petrol station?
#28
Ilnf
Supermarket petrol station or oil company petrol station?

oil company. its a jet garage
#30
check the air filter(should be quite clean if new), spark plugs(and gaps) and most important check you tyre presurres and tyre conditions when cold. Find out what they actuaqlly changed

The cold weather uses the same as warm weather except : the heated windows/heaqter/AC more lights/wind screen wipers etc(i.e the more elec u consume the more the alternator needs)
#31
whatsThePoint
tinkerbell28
Holy crap, I won't post my mpg in my beast of a people carrier. With a huge 3l diesel engine. That said hubby has accused me of "ragging" it on the school run as since I have been off the road due to an op the mpg has gone up by 8 X)


can't be any worst than my xjs used to be, if i selected 1st and put my foot down it said 1


haaaa ! i used to have a 6.0 v12 xjs with a 3gear auto didnt careabout petrol when it was 60p/litre
#32
you have had a service you say, but not all places do what they claim to have done

1mpg or so drop is not too much.

im guessing you are worried about the mpg going even low

it could be many things, a leak, even a tiny one. smallest or smallest holes in the exhaust can cuase low mpg... get this checked out, its free to do so from most places.

put your hand near all wheels after driving for a very long time, and see the difference in the heat from around the brake area (if that makes sense) if you feel a lot of heat its a sign of your brake calliper being stuck and this would mean your brakes from that side are always on, hence low mpg

it might be worth while to do a diagnostics, costs about £20 or £30, it might point out that your o2 sensor is not working, hence taking in too much fuel. it would more or less pin point many faults in the car, even if no dashboard light is on in some cases.

wheel alignment can also help improve mpg, costs about £20 or £30

again like others said.. check tyre pressure
#33
You tend to use more fuel in cooler weather.

Anything that uses electric will cause more fuel consumption, i,e blowers, wipers, lights etc

Also choke will stay on for longer, Plus traffic tends to slow down in wetter weather.

Plus natural wear on suspension, brakes tyres etc

Plus cooler air in tyres.

Lots of slight little things can impact fuel economy, Also any extra weight will affect it, All that loose change lol.

1 mpg less is actually probably very good for this time of year..!!!
#34
Apologies for the American temperatures - but you get the idea.

As if we really needed another reason to hate winter.

Those of us living in northern climes have already started to notice the seasonal decline in fuel economy, even with careful attention to sagging tire pressure (probably the best known effect of the mercury's slide).

Yet, despite diligent all-around maintenance and continued careful driving, cold weather fuel consumption can be dramatically worse than in warm temperatures.

How much worse?

Have a gander at these calculations for a Honda Civic hybrid at 60 MPH in varying ambient temperatures:

MPH-----AMBIENT-TEMP-----MPG (US)

60------------95----------52.98
60------------85----------52.62
60------------75----------51.16
60------------65----------49.12
60------------55----------47.22
60------------45----------44.67
60------------35----------43.05
60------------25----------41.54
60------------15----------39.41
60------------05----------38.09

Look at the extremes: the coldest MPG is 28% lower than the warmest. (Source.)

My own experience supports this: 12.5% worse mileage during the colder half of the year (Oct 15 to Apr 15) than for the warmest half (Apr 15 - Oct 15), on average 2002-2004 in my 1989 Accord. Comparing just the warmest months (Jun-Aug) to the coldest (Dec-Feb), the difference is even more apparent - 21.2% worse (2002).

Why so bad? Off the top of my head, I could think of a couple of reasons to explain it, but together they didn't seem significant enough to account for the magnitude of the change. With this mystery to solve, I hit Google. And here's what I learned...

9 reasons your winter fuel economy bites

1. More idling

This should be a no-brainer, yet parked idling cars are a common sight in cold weather. Resist the temptation to idle your car to warm it up. An idling engine gets 0 mpg. Consider also that idling the engine does nothing to warm up the tires and drivetrain.

Even in the coldest weather, you can begin driving after 30 seconds from a cold start - keep speeds low/moderate and use gentle acceleration until the temperature gauge starts to climb (source).

2. Low tire pressure

Of course you're smart enough to keep up your tire pressure as the temperature drops, right? A 10-degree (F) change in ambient temperature equates to a 1 psi change in tire pressure (source). Fuel economy declines 0.4 percent for every 1 psi drop (source).

3. Increased rolling resistance

Even if you're completely attentive to proper tire pressure, cold ambient temperatures will still cause your tires to return worse mileage. That's because a tire's shape isn't completely round - the sidewall bulges out at the bottom, and where the tread meets the road the small contact patch is actually flat. As the tire rotates, it constantly deforms to this shape, and this deformation requires more energy when the rubber is cold and hard. Rolling resistance at 0 degrees F is 20% greater than at 80 degrees (source 1, source 2).

4. Crappy road conditions

It's increased rolling resistance of another kind: driving through slush and snow. And then there's its wasteful polar (no pun intended) opposite: no friction at all! (A.K.A. wheelspin on ice.)

5. Lower average engine temperature

In the winter, an engine takes longer to reach operating temperature and cools off faster when shut off. Since the engine management system orders up a richer mixture when cold (proportionately more fuel in the air/fuel combination), more fuel is being burned overall.

A block heater can offset this problem (improving fuel economy by 10% in sub-zero conditions - source), as can garage parking, and combining trips (to minimize the number of cold/hot cycles).

Also related...

6. Higher average lubricant viscosity

Engine oil thickens as it cools. So does transmission and differential fluids and even bearing grease. Significantly more energy is needed to overcome the added drag these cold lubricants cause.

Using synthetic fluids can address this problem, since their viscosity changes less at extreme temperatures than traditional mineral fluids.

7. Weaker gasoline

Gasoline doesn't vaporize readily at very cold temperatures. So oil companies formulate fuel differently for cold-weather markets in the winter. Unfortunately, the changes that provide better cold vaporization characteristics also result in less available energy for combustion. You won't get as far on a liter of winter gas as you will on a liter of summer gas. (Source.)

8. Higher electrical loads

In colder temps, you use electrical accessories more often:

- lights (in higher lattitudes it's darker in the winter)
- rear window defroster (because it's easier than using the ice scraper, right?)
- heater blower motor (I don't have a/c, so this isn't balanced out during warm conditions); heated seats/mirrors
- windshield washer pump (because it's easier than using the ice scraper, right? And for frequently cleaning off dirty road spray.)

9. More aerodynamic drag

No, I'm not referring to the layer of snow you're too lazy to brush off the top of the car (though that would hurt mpg too).

A vehicle's aerodynamic drag is proportional to air density, and the density increases as temperature drops. For every 10 degree F drop in temperature, aerodynamic drag increases by 2% (source).
#35
1mpg reduction.......... have you not felt a drop in temp recently ? theres your answer... more drain on the car.. heaters, lights etc etc..

If it had dropped by 50%, then yes they may be an issue, but just 1 MPG........ I can knock my average down by 10mpg if i drive it hard.
#36
colder weather?

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