997.2 Fuel Economy

[sanjoyp]

Magic919 said:

Never seen RFT on a 997.2 before.

Are these not OEM?

With them being RFTs I would assume they would help MPG if anything.

S

[sanjoyp]

mikep240 said:

Hmm....Have you considered having a 'Hydrogen clean'? My business partner runs a dfi Cayenne S, he had a guy treat his motor with this system, it showed a 10% increase in mpg.

Dfi engines have zero fuel going through the intake ports to keep them clean, hence they block with gunk. Google the phenomenon, they look truly horrendous in a relatively short time. The 'cleaning' cost around a hundred quid and made a significant difference to his 72k miles car, he noted that after the treatment it felt like the sport button was on when it was off. Cleaning the intake ports means that the engine is taking in the proper amount of air to match the theoretical fuel input. A maf sensor only knows the global air consumption rather than cylinder specific.

I realise this may not be everyones cup of tea, but as a very sceptical person, I was impressed. No affiliation, I can't even remember the company name. It did work though. The experience of seeing this has not put me off a buying a 997.2 if and when I decide to change my 996 turbo.

I do like the idea and I think I have seen something similar on Wheeler Dealers but having only bought the car a few months ago from OPC I want them to fix.

[Magic919]

RFT not usual on a 997.

[sanjoyp]

Can I ask a favour? I am going back in to OPC next week to get some window seals sorted. I would like to go in forearmed re my fuel consumption.

Could I ask GTS owners to state their average fuel consumption and model details? Ideally with 10 people stating they are getting in the 20s I will have some more leverage for them to investigate.

E.g.
2012 C4 PDK 16.5mpg
2011 C2 Man 18.9mpg

etc.

TIA

S

[Big E 118]

2011 997 GTS 2wd - Average 19.2 MPG

The car is on Michelin Cup 2 tyres.

I do only use the car for fun drives so it's driven enthusiastically most of the time. On the odd euro jaunt where I've spent the day on the motorway I've seen 34 MPG.

I filled up during a track day at Snetterton the other week and with a full tank it was showing a range of 96 miles! Not sure of the tank size but that has to be single figures MPG!

[sanjoyp]

3 hours of average speed cameras on the A9 at low temperatures.

3 hours @ 60mph and still only 25 mpg.

Edited by sanjoyp on Monday 28th November 21:03

Apologies for the life of me I cannot rotate this!

Edited by sanjoyp on Wednesday 7th December 20:33

[Carl_Manchester]

my turbo on cup2s would reduce my mpg by around 10% in comparison to my winter sottozero2 n1. 20mpg on cup2 22mpg on sotto. motorway miles. vpower nitro. do have a heavy right foot though.

bridgestones were somewhere in between for mpg but i would buy cup2s if i could afford it as the stones feel their age in terms of their design. noisy and lacking in grip. only positive is wear rate.

Edited by Carl_Manchester on Tuesday 29th November 08:21

Edited by Carl_Manchester on Tuesday 29th November 08:21

[Ape50]

I have a 2010 C2S on Supersports and use V-Power. On a hardish run I tend average about 20mpg. Europe tours come in at around 24mpg - motorway miles obviously higher.

[andyc11]

I'll try grab a pic this weekend but as earlier, averaging 24mpg and mine is also on Bridgestones (definitely not run flats).

[David W.]

On winter tyres here now so will reset trip and see what effect they have, if any.

[Nineexcellence]

Hi,

My gut feeling if the car has already be given a clean bill of health that it is related to the intake and the issue with the dfi design. We have already seen first hand on similar mileage cars in the intake the amount of rubbish that resides.

Re the hydrogen cleaning, we were a little skeptical of this. However, we did a controlled test on one of our shop cars - cayenne diesel 2011 with 87000 miles on it. As controlled as possible, using cruise control, on the exact same starting point, even making sure the fuel level was identical between the tests. You can see the before and after results - quite amazing. I think on average with mixed driving we have picked up 4-5mpg.

This would be my first point of call to have done.

I am making the assumption of course that you are not driving with the window open in your car OP, or have a roof rack etc.

[EGTE]

From bitter experience on BMWs, I found that runflats can cost you 5MPG (as well as ruining the ride, being irrepairable and hideously expensive).

Get rid, ASAP.

[sanjoyp]

andyc11 said:

I'll try grab a pic this weekend but as earlier, averaging 24mpg and mine is also on Bridgestones (definitely not run flats).

What sort of driving is that Andy? HonestJohns website is showing 25 as the official combined which I would expect to exceed when going at 60 for 3 hours!

[ATTAK Z]

997.2 C2 PDK
25 mpg @ av 35 mph

2004 350Z on same daily run (50% motorway, 5% town, 45% country)
24 mpg @ av 34 mph

so the Porsche is faster and more economical than the Nissan

[chriscoates81]

ATTAK Z said:

997.2 C2 PDK
25 mpg @ av 35 mph

2004 350Z on same daily run (50% motorway, 5% town, 45% country)
24 mpg @ av 34 mph

so the Porsche is faster and more economical than the Nissan

And more practical