What mpg are you getting ?

trishh

Bought a Fiat Doblo deisel van few months back. It was doing 50 mpg. Put it in for nct/doe (whatever you call it) test and now only doing 43mpg. Is this normal? Have you found a lowering of mpg after testing? I have been told that it should revert to original mpg but hasn't after two months ! Have any of you had this happen ?

alias no.9

Have you had it serviced recently or is it nearly due a service? Are you carrying heavier loads now? Are you doing different driving, i.e. were you doing a lot of out of town driving then and lots of town driving now? I really don't see how the NCT could have affected the MPG.

trishh

It was serviced previous to test. Not driving different, same routine, load hasn't changed. I've been back to the mechanic that done test to ask him what he did to cause change in mpg. He said all he did was to put some fluid (don't know name of it) through the engine to reduce emissions. He claimed this could reduce mpg but would revert to original mpg within a week or so. This is now 2 months down the road ! Wondering if this has happened to anyone else. Maybe someone here could give some insight on this "fluid" to reduce emissions.

el tel

The colder weather since your first got your car will also have had a detrimental effect on your fuel consumption since your engine doesn't operate efficiently until it is warmed up. In colder weather (like now) it takes longer for your engine to warm, and especially on short trips, your car operates a smaller percentage of time at the desired temperature. Also make sure your tyres are properly inflated as tyre pressure drops in colder weather causing more rolling resistance which also increases fuel consumption, albeit to a slightly lesser extent.

(To an even lesser extent the increased weight of the vehicle due to the additional clothing worn by passengers in colder weather may also increase fuel consumption. My advice would be to drive naked :rolleyes: )

Furp

Also with less daylight hours and the weather you are probably running electrics more such as lights, heaters, etc.

I always find that my petrol consumption drops by a few mpg coming into winter, not to mention the traffic gets heavier hence more fual consumed sitting in traffic.

Kersh

At the minute, 18mpg.

ambro25

At the minute, about a 1,000 mpg (electric moped)

JohnBoy

27-29 MPG
92 range rover classic 2.5 tdi

"STONE HIM, STONE HIM"

i'll be going back to my 50+mpg focus td soon

ds20prefecture

About 17mpg in town.

trishh

el tel wrote:

The colder weather since your first got your car will also have had a detrimental effect on your fuel consumption since your engine doesn't operate efficiently until it is warmed up. In colder weather (like now) it takes longer for your engine to warm, and especially on short trips, your car operates a smaller percentage of time at the desired temperature. Also make sure your tyres are properly inflated as tyre pressure drops in colder weather causing more rolling resistance which also increases fuel consumption, albeit to a slightly lesser extent.

(To an even lesser extent the increased weight of the vehicle due to the additional clothing worn by passengers in colder weather may also increase fuel consumption. My advice would be to drive naked :rolleyes: )

ok, so, my best chance of getting more mpg is to

drive naked

with no

lights, heaters

and no

short trips

. Ok, got it ! If anyone sees a Fiat Doblo being driven by a frozen naked person.. Wave to me !

el tel

I'll wave only if you stop and give me a lift

Mr Magnolia

Furp wrote:

Also with less daylight hours and the weather you are probably running electrics more such as lights, heaters, etc.

Do the lights and heater not run off the altenator when the car's running??

I'm getting 57mpg (Vectra)

trishh

Sparks400 wrote:

Do the lights and heater not run off the altenator when the car's running??

I'm getting 57mpg (Vectra)

That must be true ! It should be only manner of driving and load you're carrying that should affect mpg, is it?

trishh

Sparks400 wrote:

I'm getting 57mpg (Vectra)

WOW !! That's bloody good from a 1.6 !

Moanin

Peugeot 307 1.4HDI 64mpg

tinofapples

[PHP]WOW !! That's bloody good from a 1.6 ![/PHP]

A diesel I'm sure .

Mr Magnolia

trishh wrote:

WOW !! That's bloody good from a 1.6 !

Sorry Trish, its a 2ltr Turbo Diesel

Downtime

Around 50mpg out of town
Around 30 mpg in town

1.6 Golf

Slaanesh

85 mpg on my Yamaha YBR 125.

Used to get 113 mpg when I was breaking it in, but now I drive it harder.
Probably get about 45-50 mpg in my Citreon Xsara 1.4l

bennyc

57 from a 1.6 vectra no chance I am lucky if i get 30 from a 00 1.6 vectra
and thats country miles
Time to switch to Diesel

AMurphy

On the 2.5L V6 Camry, 22~23 M/USG =~ 26mpg (UK)
3.3L-V6 Minivan, 21~22m/USG, =~ 25.8mpg (UK).

unkel

7-series 3.5l V8

Dublin: 20MPG
Country: 30MPG

lazylad

Im getting 33 mpg but my new car should take 50mpg.
I drive long distance so it would be good. but i live on top of the hills so cant drive too smooth

Seth Brundle

97 2.5L 5 series
If I monitored mpg then I'd probably get rid of the car!

Stephen

I'm getting about 42 mpg... '00 Fiesta 1.25 zetec.

edit: Mostly from twice-daily 12 mile hops through the countryside to work.

duridian

trishh wrote:

Sparks400 wrote:

Do the lights and heater not run off the altenator when the car's running??

I'm getting 57mpg (Vectra)

That must be true ! It should be only manner of driving and load you're carrying that should affect mpg, is it?

Nope, to the best of my knowledge, the electrical load affects mpg. The energy powering electrics like headlights and heaters/window defogger is generated by the alternator, but the alternator is powered/turned by a belt that is driven by the engine. The harder the alternator has to work, the more of a load on the engine and ultimately more fuel is burned. The same applies to air conditioning if your vehicle has it, as the AC compressor is also driven by a belt from the engine.

lomb

7 mpg-aston martin vantage 550bhp
just kidding, your question is like how long is a ball of string, every bhp/torque/large engines/heavy cars/safety equipment/aerodynamics/looks/petrol/diesel etc are all compromises. what suits one person wont suit another. hence the GULF in car types,costs and relative economies.
and yes its the winter thats causing your increased consumption, cold weather, and heating etc add 15% to your economy and headlights probably add another few percent.

IDMUD

17 mpg in my Impreza, the evo should get over 20. I'm not complaining though with the little driving I do.

Mothman

Borrowed a Skoda Octavia 1.9TD, and was shocked at getting 74.4mpg doing nearly 250miles, inc going through Dublin City centre and being parked on the M50. The heavy traffic had a positive effect on economy as a lot of the travelling was at 80-100k, although going at 120k didn't have too much of a negative effect.

Greenman

Opel Vectra 1.7D 1990 880 Kms with 42 litres of diesel

Seth Brundle

Greenman wrote:

Opel Vectra 1.7D 1990 880 Kms with 42 litres of diesel

I presume this is not an average.
If we are listing our best mpg then mine is probable over 650 miles in the 97 523i on the autoroutes in France last year with less than one tank (~60L) - most of which was done between 100 and 130mph

dogg_r_69

About 38 mpg average on 1.4 Megane lately due to very short journeys to work Got 42 for a while when I was working a bit farther away
The parents are getting 60+mpg from their 110bhp Seat Toledo TDi

unkel

kbannon wrote:

I presume this is not an average.
If we are listing our best mpg then mine is probable over 650 miles in the 97 523i on the autoroutes in France last year with less than one tank (~60L) - most of which was done between 100 and 130mph

I take it you meant km/h?

Your 50MPG is still amazing at those cruising speeds

Seth Brundle

unkel wrote:

I take it you meant km/h?

Your 50MPG is still amazing at those cruising speeds

erm oh yeah - it must have been km/h as otherwise I would have been speeding

Fey!

1998 BMW 520iSE - 20mpg in town and up to 35mpg on long runs. Mine is low as it's mainly cold engine stop/start driving. Normally get 350 miles to my 80 litres (town). Best so far has been 500 miles on long runs.

That said, a tank will keep me going for about 2 1/2 weeks at the moment.

Trish - Aircon can make up to a 10% difference to your economy, as do things like roofbars/boxes (extra drag on the vehicle). I always drive with my lights on, which makes, I believe, a 2-3% difference; I'd prefer to leave no "I didn't see him coming" excuses if I'm hit, though!!!

Over/Under inflated tyres will make a difference (as well as having your tyres changed more regularly!).

I put STP line cleaner/valve cleaner through my fuel about every 6 months - found that it made a difference the first time I did it.