Advertised fuel consumption vs Real fuel consumption

Pox

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Sep 13, 2005
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^This
Plus if it is your driving style, then a turbo-diesel will only exaggerate your problem.
Find out what you are doing wrong first ;)
 

ConnaF

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Feb 16, 2015
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Diesels are much lighter than petrol if you compare them head to head without changing the driving style. The cheapest option will probably be to adjust my driving style for the next 5 years. OUCH!

I drove my wife's 1.5dci Renault duster to Mthata and back to Bloem (1080km) in one day and the weekend after that the same car from Bloem to Pretoria and back to Bloem (920km). The fuel consumption was at it's worse 14,2km/l and best 15/8km/l.

My speed was between 120-130km/h and at some places up to 140km/h when I had to overtake. Now my problem is that if do the same type of driving with this car the fuel consumption goes for s...t.

I have 5 years of driving and 60 payments left since I have this car now for only 2 weeks. If I drive this car to Pretoria this weekend and the fuel consumption is not 13km/l or better then it's going to be traded for a diesel, since 3000km per month at the current fuel consumption over 5 years is not worth it.
 

akescpt

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22,459
Diesels are much lighter than petrol if you compare them head to head without changing the driving style. The cheapest option will probably be to adjust my driving style for the next 5 years. OUCH!

I drove my wife's 1.5dci Renault duster to Mthata and back to Bloem (1080km) in one day and the weekend after that the same car from Bloem to Pretoria and back to Bloem (920km). The fuel consumption was at it's worse 14,2km/l and best 15/8km/l.

My speed was between 120-130km/h and at some places up to 140km/h when I had to overtake. Now my problem is that if do the same type of driving with this car the fuel consumption goes for s...t.

I have 5 years of driving and 60 payments left since I have this car now for only 2 weeks. If I drive this car to Pretoria this weekend and the fuel consumption is not 13km/l or better then it's going to be traded for a diesel, since 3000km per month at the current fuel consumption over 5 years is not worth it.

just get a polo gti and be done with it.
 

bob1

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Sep 30, 2010
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243
Maybe use the Discovery Insure app on your smartphone to check how you driving compares to others
 

SpenK

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Jan 28, 2015
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My intergalactic luxury barge (5 series 528i) does avg 8.6l per 100K's mixed.
But Im a master of rolling in neutral, slowing down for red traffics lights but not coming to a complete stop to line it up just before going green.
The less you use your brakes the more fuel you save.
 

Kix

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Joined
May 4, 2010
Messages
258
Diesels are much lighter than petrol if you compare them head to head without changing the driving style. The cheapest option will probably be to adjust my driving style for the next 5 years. OUCH!

I drove my wife's 1.5dci Renault duster to Mthata and back to Bloem (1080km) in one day and the weekend after that the same car from Bloem to Pretoria and back to Bloem (920km). The fuel consumption was at it's worse 14,2km/l and best 15/8km/l.

My speed was between 120-130km/h and at some places up to 140km/h when I had to overtake. Now my problem is that if do the same type of driving with this car the fuel consumption goes for s...t.

I have 5 years of driving and 60 payments left since I have this car now for only 2 weeks. If I drive this car to Pretoria this weekend and the fuel consumption is not 13km/l or better then it's going to be traded for a diesel, since 3000km per month at the current fuel consumption over 5 years is not worth it.

OK, so the SUV you are talking about is a Duster DCi?

The Duster weighs in at 1180kg, and the Vivo Maxx at 1089kg. Very nearly the same.

The only thing counting against the Duster is the raised ride hight and the fact that it is shaped like a brick. Now the Maxx also has raised right height, etc. And still you are hoping to better the Duster DCi's fuel consumption with a relatively old tech 1.6 petrol in a similarly sized car? Not going to happen. I can nearly guarantee that the Maxx will use more fuel than the Duster in any and all driving situations.

Oh and trading the Maxx for a diesel is insane. Go and calculate how far you can drive with the difference in the purchase price between the two.
 
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Nangi

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Jul 28, 2012
Messages
507
That's ridiculous. I have the same engine and when driving hard the average is about 8... speed limit highway high 5s to mid 6s.. High speed highway long distance (full throttle or full breaking kinda speeds) saw 9.6 over 450kms...
 

dj_jyno

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Sep 22, 2007
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4,210
My intergalactic luxury barge (5 series 528i) does avg 8.6l per 100K's mixed.
But Im a master of rolling in neutral, slowing down for red traffics lights but not coming to a complete stop to line it up just before going green.
The less you use your brakes the more fuel you save.
You know that uses more fuel than coasting in gear, right?
 

Masataka

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Joined
Nov 5, 2008
Messages
892
VW always build under-powered engines when compared to their competition, and they tend to be a lot less efficient because of that, but 10l/100km is a bit crazy for a new engine! I used to get 11l/100km on my 330i.
 

SpenK

Active Member
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Jan 28, 2015
Messages
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You know that uses more fuel than coasting in gear, right?

I've heard so, but I watch my fuel consumption drop if i roll a huge hill in neutral.
Do you have any supporting information i could look at ?
 

Hamster

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I've heard so, but I watch my fuel consumption drop if i roll a huge hill in neutral.
Do you have any supporting information i could look at ?
When in neutral your engine needs fuel to keep going. When you are rolling down a hill in gear the wheels are essentially turning the engine and there is no need for fuel. You have to be in a lower than required gear though - rolling down a slight incline in 6th ain't gonna work.
 

ConnaF

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Feb 16, 2015
Messages
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Thanks for all the input from everyone. I will make my final decision after this weekend when I had the car for more than 1000km and drive it the way I have done the last 10 years. The only speeding tickets I got were for driving in town at 70km/h in a 60km/h zone.. Zero/nada on the open roads, so I cannot make peace with the fact that I need to change my driving style on a 2014 model car in order to get more than 10km/l.

I did the calcs before I made the statement of trading the petrol for a diesel. The reason for buying this car is to have vehicle that can last 10 years but to pay it off in 5. The other 5 years I want to buy myself a 4x4 and use it for weekends and holidays so I can keep it for longer.

If I settle for a car that gives me 10km/l now then over the next 10 years the difference in the cost of fuel between the diesel and petrol at todays fuel prices will amount to more than R60,000. And still I could have bought myself a 2liter car with better performance and the same fuel consumption, or diesel also better performance and better fuel consumption...

The diesel is more expensive to maintain however if I take out an additional maintenance plan for R270 per month after the current maintenance plan has expired it should be sufficient.
 

ConnaF

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Feb 16, 2015
Messages
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Oh, yes and yesterday I went to the dealers and they confirmed that 20km/l is what they got without the aircon running, late morning easy traffic and they drove 30km in town and 50km out of town. It's a good thing that the car was so light on fuel then because the whole excerise only cost me R66!

At least I know there's nothing wrong with the car...

I'll rather test the car under normal driving circumstances and make up my mind.
 

Kix

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May 4, 2010
Messages
258
Oh, yes and yesterday I went to the dealers and they confirmed that 20km/l is what they got without the aircon running, late morning easy traffic and they drove 30km in town and 50km out of town. It's a good thing that the car was so light on fuel then because the whole excerise only cost me R66!

At least I know there's nothing wrong with the car...

I'll rather test the car under normal driving circumstances and make up my mind.

I have no idea how the hell they got 20km/l on that trip.

You should then at least get 14km/l or so with the A/C and driving normally.
 

ConnaF

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Feb 16, 2015
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I agree, even 13km/l would do!

20km/l the dealers got is very impressive... I told them they are wasting my time.
 

Leftfoot

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May 15, 2006
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Back in the day my first Polo 1.4 (when re branded SEAT's were first introduced to SA) did 4.6l/100km off the floor. Its first service cocked things up a bit and it shot up to 6.7l/100km and seemed more sluggish. When I told the service dept about this they just said they had loaded the SA specs on to the cars computer system and could not adjust it back.
 

ConnaF

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Feb 16, 2015
Messages
33
Why don't they just leave it as it is if there is nothing wrong with it? It's Ok to check the computer for any problems but to change the mapping when all is ok, is just stupid.

The reason why they didn't want to change the mapping to the original settings was probably because they don't have a backup or other settings than the ones on their system.
 
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