Gotta love Tdi economy

[rearrange]

Is that the new CR version or the old 1.9 PD?

Preeny has one of the latter and says here that he has gotten 7.6l/100km average for Orange to Drysdale whilst towing a CAR TRAILER with the Mk1 on the back (and I don't doubt him for a moment)

Mine is the old 1.9. It now has 9600kms on the clock. I did same Adelaide to Penola trip when the car was new at Easter last year and it returned 7.5L/100km with a passenger, lots of luggage, and lots of full acceleration overtaking all the slow moving holidaying breeder-wagons. I just can't believe this latest trip didn't beat that figure by more than 0.1L difference.

[rearrange]

I don't think the cruise control will do you any favours if your going up and down any hills. on a dead flat road, cruise might be better than the foot, but the brain is much better at being economical once hills come into play. (note, i've no idea if there is much in the way of hills i your area)

At least 600km of the 800km trip is flat roads. The Adelaide Hills are at one end, but they are hardly steep and 110km/h is easily maintained. I'm not expecting to set any economy records ... I'm not that sort of driver

[Preen59]

Gees mate you should be able to beat those numbers....

Re: cruise control..

I haven't found any improvement from using the foot over the cruise on the Caddy at all.

[William_Foster]

I have a 6R TDI Polo with DSG [With all the options, whichmakes it heavier than the standard] and I haven't really been overly impressedwith the fuel economy so far [I only use Caltex Vortex Diesel]. The brochurestates combined fuel consumption of 4.6, urban 5.5, and extra urban 4.0; so farI have done nearly 4,000kms and have average 6.0 in total; which includes fourtrips of 400+ kilometres and I have only seen a figure in the high 4's once ortwice.

I was told that once the motor bedded in a little the fuelperformance would improve, but there is no sign of it yet.
Yesterday I tried manual up shifting and using the DSG onthe downshifts on a 70+ kilometre journey on rural roads and found thatreturned a better than usual figure of 5.6; but till not brilliant. I havemucked around with cruise control and didn't find any noticeable difference inmy car.

Am I just being too picky to be expecting better fueleconomy?

[kaanage]

Sadly, your report is in line with the experiences of UK Polo 6R 66kW TDi owners. The issue seems to be the implementation of the DPF is poor so a lot of fuel is "wasted" due to frequent regeneration cycles. In addition, the low end torque seems to have been tuned out, probably to prevent driving below 1900rpm to avoid even more frequent regen cycles. This means that you don't get to drive in the diesels most economical rev range.

As a comparision, my 9N3 Polo TDi, which has the 1.9 PD engine with no DPF, can be driven off idle (literally - I often shift up at 1500rpm) and I get around 5.5l/100km around town and 4.5l/100km in the country. Preeny's Caddy uses the same engine

[gldgti]

I think that gldgti is suggesting that a driver can get better economy than the cruise control as the driver can make small speed adjustments anticipating changes in the terrain (eg increase speed a bit downhill to help roll up the next hill while bleeding off a bit of speed) rather than just holding at a set speed all the time. This makes your fuel economy figures even more impressive.

exactly. What i'm really arguing is basic physics - its more efficient to do as kaanage described above than to keep the same speed. even going +5 to -5 from your cruising speed from the bottom of a hill to the top saves you fuel.

[rearrange]

Gees mate you should be able to beat those numbers....

Thanks Preeny ... maybe I should try towing a Mk1 Golf on a trailer behind me everywhere?

[kaanage]

Just did a trackday and the Polo still stayed under 12l/100km despite my best efforts to stay on full throttle for as much of the time as possible.

[5pot]

I managed 966km in my '05 Golf 2.0 TDI between Melbourne and Sydney. No fuel light either so I reckon I could have broken 1000 fairly easily before needing to refuel.

[Preen59]

Thanks Preeny ... maybe I should try towing a Mk1 Golf on a trailer behind me everywhere?

Maybe! I have new figures with proof from towing the Mk1 back home. I'll load the picture later.

[gldgti]

I have a 6R TDI Polo with DSG [With all the options, whichmakes it heavier than the standard] and I haven't really been overly impressedwith the fuel economy so far [I only use Caltex Vortex Diesel]. The brochurestates combined fuel consumption of 4.6, urban 5.5, and extra urban 4.0; so farI have done nearly 4,000kms and have average 6.0 in total; which includes fourtrips of 400+ kilometres and I have only seen a figure in the high 4's once ortwice.

I was told that once the motor bedded in a little the fuelperformance would improve, but there is no sign of it yet.
Yesterday I tried manual up shifting and using the DSG onthe downshifts on a 70+ kilometre journey on rural roads and found thatreturned a better than usual figure of 5.6; but till not brilliant. I havemucked around with cruise control and didn't find any noticeable difference inmy car.

Am I just being too picky to be expecting better fueleconomy?

The engine wont be really nice and loose and with good compression for quite a while - 20,000km at least before it gets nice and bedded in.

[William_Foster]

Thanks for the tip GLDGTi; I will keep an eye on it over the long term.

[Preen59]

As promised..

Here's proof of the mileage. This was towing a car trailer with a Mk1 on the back. A few heavy parts in the car. In the Van i had a full Mk1 Golf front clip, 2 GT3 seats, some other random parts, a tool bag and my gear. I ended up with 7.4l/100km over the intire trip. Pic is as I was cruising up the Hume. Actual GPS speed said 107km/h.




And here's the milage from a trip to Forbes on Tuesday..




Tell me your pruis can do that. Go on..

[rearrange]

As promised..

Here's proof of the mileage. This was towing a car trailer with a Mk1 on the back. A few heavy parts in the car. In the Van i had a full Mk1 Golf front clip, 2 GT3 seats, some other random parts, a tool bag and my gear. I ended up with 7.4l/100km over the intire trip. Pic is as I was cruising up the Hume. Actual GPS speed said 107km/h.




And here's the milage from a trip to Forbes on Tuesday..




Tell me your pruis can do that. Go on..

I'm jealous. I'm going to print that out and show it to my Caddy on the hope that it is embarrassed

[kaanage]

Get a remap - then you will get more torque at low rpm (as well as more power at high rpm) so you can shift earlier and use less accelerator. Plus it makes the whole car (van) more fun to drive, although you WILL use more fuel if you use the extra top end all the time.

Plus try a good (TC-W3 or JASO FB or higher) 2 stroke oil @ 200:1 in your fuel since you don't have a DPF.