Maxium from one tank

[PaulM]

MKV GTI Manual. Best I have had is several runs up the valley at 6.8L/100kms which is around 720kms but my average around town is 9.5L/100kms which is 510kms.

Personally I don't see the point in people who choose the 2.0tdi GT over the GTI just for fuel consumption if you do the math on how many kms you do per year and the saving of a diesel it works out to be only a few hundred dollars per year, unless of course you're doing huge kms a year like 50,000kms then it totally makes sense to go with a TDI.

I'm always interested in this fuel economy debate as we all love to save $$ so we can spend elsewhere.

So lets assume each vehicle (GTD & GTI) does 20 000km per year.

I'll base calcs on VW's official urban consumption figures as that makes the comparison valid.

GTD - Urban fuel consumption is 7.2L per 100km
GTI - 10.2L per 100km

So a 60L tank gets:
GTD - 60 / 7.2 x 100 = 833km roughly. 20 000km per year / 833km per tank = 24 tanks of fuel per year
GTI - 60 / 10.2 x 100 = 588km. 20 000 per year / 588km per tank = 34 tanks per year

Now we turn to cost:
GTD - 60L x $1.554 average price of diesel per litre) (average price is for Darwin as it's easier for me lol) = $93.24 per tank
GTI - 60L x $1.596 average price of PULP) = $95.76 per tank

So overall costs:
GTD - $93.24 x 24 tanks per year = $2 237.76 fuel bill
GTI - $95.76 x 34 tanks per year = $3 255.84 fuel bill

Therefore on fuel you're saving $1k. Add in the lower maintenance costs, then the $$ figures start to impress

[stickshift3000]

Personally I don't see the point in people who choose the 2.0tdi GT over the GTI just for fuel consumption

How quick costs will be recovered depends mainly on the price paid for the car, annual mileage and where the majority of your driving is done (urban or highway, long or short trips). It's a given that the diesel will cost less at the pump for the miles covered.

I bought the diesel because it's a better tow car.

Edit: My best mileage was an actual (gps measured) 1040 km's, still had a couple of litres left in the tank. That trip (nearly all highway miles) equated to an actual consumption of 4.8L/100km for the majority of the trip (my car has a decent power box added).

[brad]

I'll base calcs on VW's official urban consumption figures as that makes the comparison valid.

But most people don't have the same driving patterns as the consumption tests.

GTD - Urban fuel consumption is 7.2L per 100km
GTI - 10.2L per 100km

Why would you only use the Urban figures? What is wrong with the Combined or Hwy figures? I realise you are trying to use a known datum but reality often doesn't match that datum.

So a 60L tank gets:
GTD - 60 / 7.2 x 100 = 833km roughly. 20 000km per year / 833km per tank = 24 tanks of fuel per year
GTI - 60 / 10.2 x 100 = 588km. 20 000 per year / 588km per tank = 34 tanks per year

They have 60l tanks?

Now we turn to cost:
GTD - 60L x $1.554 average price of diesel per litre) (average price is for Darwin as it's easier for me lol) = $93.24 per tank
GTI - 60L x $1.596 average price of PULP) = $95.76 per tank

In Sydney, Diesel is usually more expensive than PULP98

So overall costs:
GTD - $93.24 x 24 tanks per year = $2 237.76 fuel bill
GTI - $95.76 x 34 tanks per year = $3 255.84 fuel bill

Therefore on fuel you're saving $1k. Add in the lower maintenance costs, then the $$ figures start to impress

In what way are the maintenance cost of VW diesels cheaper than VW petrol engines?

Plus the cost of getting an ECU remap to bring the diesel up to TSI power levels. Have driven both & I found the diesel somewhat underwhelming with the reduced power & shorter redline.

[PaulM]

But most people don't have the same driving patterns as the consumption tests.


Why would you only use the Urban figures? What is wrong with the Combined or Hwy figures? I realise you are trying to use a known datum but reality often doesn't match that datum.


They have 60l tanks?

In Sydney, Diesel is usually more expensive than PULP98


In what way are the maintenance cost of VW diesels cheaper than VW petrol engines?

Plus the cost of getting an ECU remap to bring the diesel up to TSI power levels. Have driven both & I found the diesel somewhat underwhelming with the reduced power & shorter redline.

1. If one was to consider every driving pattern out there then it would never happen. You have to have a baseline otherwise any analysis is simply redundant. Always best to use official figures

2. I used urban as that would be the predominate driving use IMO. And, it's also the highest consumption rate which therefore gives a theoretical maximum as opposed to the useless "combined" figure.

3. I used the Mark 6 60L tank as it was easier to find in my limited time

4. "Usually more expensive" is untestable sorry so I had to have something to go on

[brad]

1 &2) So you needed to use Official figures based on your own opinion of what the predominant driving pattern is - isn't that contradictory? Or is it just convenient for the premise you are presenting?

3) I didn't realise the Mk6 had gained 5L

4) No more untested than you using the fuel pricing from Darwin. I mean, we all commute up to Darwin to buy our fuel, don't we?

In Sydney, the cost of fuel goes up & down like a brides nighty. PULP98 fluctuates by ~20c in a 7 day cycle. Deisel is a bit less erratic but still moves. I'm reasonably sure that it is consistently more expensive than PULP98 but I don't keep a close eye on it as the wife's car is diesel & she looks after her own fuelling issues.

Congrats on avoiding the maintenance cost question.

We've had a couple of diesels (Captiva & Mondeo) & neither has convinced me that diesel will save much money in the long run. I'd have thought that the attraction of diesel was the torque?

[jessv3]

I'm always interested in this fuel economy debate as we all love to save $$ so we can spend elsewhere.

So lets assume each vehicle (GTD & GTI) does 20 000km per year.

I'll base calcs on VW's official urban consumption figures as that makes the comparison valid.

GTD - Urban fuel consumption is 7.2L per 100km
GTI - 10.2L per 100km

So a 60L tank gets:
GTD - 60 / 7.2 x 100 = 833km roughly. 20 000km per year / 833km per tank = 24 tanks of fuel per year
GTI - 60 / 10.2 x 100 = 588km. 20 000 per year / 588km per tank = 34 tanks per year

Now we turn to cost:
GTD - 60L x $1.554 average price of diesel per litre) (average price is for Darwin as it's easier for me lol) = $93.24 per tank
GTI - 60L x $1.596 average price of PULP) = $95.76 per tank

So overall costs:
GTD - $93.24 x 24 tanks per year = $2 237.76 fuel bill
GTI - $95.76 x 34 tanks per year = $3 255.84 fuel bill

Therefore on fuel you're saving $1k. Add in the lower maintenance costs, then the $$ figures start to impress

The average person in Australia does 15,000kms per year. Also you would have to base the figures on the likely hood that most people don't do 100% urban driving (and those who do mostly urban driving in a TDI will have higher then average consumption because of the shorter distances due to the extended warm up time) this closes the gap substantially to:

GT TDI- Average 6.6L per 100km
GTI - 8.1L per 100km

an extra 1.5ltr per 100 x 15,000kms =225ltrs = $344.25

[PaulM]

1 &2) So you needed to use Official figures based on your own opinion of what the predominant driving pattern is - isn't that contradictory? Or is it just convenient for the premise you are presenting?

3) I didn't realise the Mk6 had gained 5L

4) No more untested than you using the fuel pricing from Darwin. I mean, we all commute up to Darwin to buy our fuel, don't we?

In Sydney, the cost of fuel goes up & down like a brides nighty. PULP98 fluctuates by ~20c in a 7 day cycle. Deisel is a bit less erratic but still moves. I'm reasonably sure that it is consistently more expensive than PULP98 but I don't keep a close eye on it as the wife's car is diesel & she looks after her own fuelling issues.

Congrats on avoiding the maintenance cost question.

We've had a couple of diesels (Captiva & Mondeo) & neither has convinced me that diesel will save much money in the long run. I'd have thought that the attraction of diesel was the torque?

I'm not sure why you're attacking me when I clearly prefaced my results with my assumptions. Where are yours - all you say is "I'm reasonably sure" yet happy to have a dig at me for giving exact figures & calcs?

And yes, the Mark 6 has a 60L tank.

Looking at your "reasonably sure" and given that the Sydney market is quite diverse, here are this mornings figures for PULP in the City - highest was 158.9, with Diesel 147.9.

To be fair here are the cheapest:
PULP - 146.9
Diesel - 142.9

So between 4 & 10c a litre more $$ is going to eat away at your fuel budget more quickly for sure. That's indisputable.

Figures from MotorMouth - Fuel Prices and Petrol Prices Australia

[brad]

I was trying not to attack you & therefore using less agressive language.

You win.