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Raptorace
Newbie


Joined: 13 Mar 2012
Posts: 33



PostPosted: Tue Apr 24, 2018 8:28 pm    Post subject: Fuel economy is terrible! Reply with quote

I’ve had my 991.1 Carerra S for 6 weeks now I’m in staggered how bad the fuel economy is.
In my previous car, a 997.2 I would achieve an average 23mpg, with mixed driving spirited and cruising. In the 991.1 I’m getting 18mpg.

I’m not one that normally worries about fuel economy, but I expected better as it’s frustrating making so many visits to the petrol station.

So just wondered what mpg others get and if I have some kind of fault?
 



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Palladium
Indianapolis


Joined: 01 Nov 2015
Posts: 2496



PostPosted: Tue Apr 24, 2018 8:54 pm    Post subject: Reply with quote

could it be the pcv valve/hose, are you getting a check engine light?
 
  
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HSC911
Zolder


Joined: 23 Jul 2014
Posts: 5375
Location: Bedford


PostPosted: Tue Apr 24, 2018 9:26 pm    Post subject: Re: Fuel economy is terrible! Reply with quote

Raptorace wrote:
So just wondered what mpg others get and if I have some kind of fault?


Not enough but who cares Dont know

Grin

Beats driving a euro box blue efficiency DPF Vegan electric (excluding Tesla) CO2 free ecoFLEX 0.9 litre green thing Thumb
 
  
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Raptorace
Newbie


Joined: 13 Mar 2012
Posts: 33



PostPosted: Tue Apr 24, 2018 9:28 pm    Post subject: Reply with quote

Palladium wrote:
could it be the pcv valve/hose, are you getting a check engine light?


No check engine light on.
 
  
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Phil 997
Brands Hatch
Brands Hatch


Joined: 05 Dec 2015
Posts: 14297
Location: Bournemouth,Dorset

2009 Porsche 997 Carrera 4S

PostPosted: Tue Apr 24, 2018 9:48 pm    Post subject: Reply with quote

my 997.2 only does 18 ave but I do have mods on it , are you using superunleaded in it. Thumb
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Cameo
Trainee


Joined: 27 Dec 2015
Posts: 99
Location: South Coast


PostPosted: Wed Apr 25, 2018 7:09 am    Post subject: Reply with quote

I’ve always been impressed with the economy. I did a 130 mile run of M, A and B roads yesterday (no town stuff) and got 28 mpg. On long steady motorway runs I can get over 35 mpg - no doubts thanks to 7th gear overdrive. All figures based on the car’s computer figures.

No idea on ‘hoons’.
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DRZ911
Barcelona


Joined: 13 Mar 2013
Posts: 1395
Location: Belfast


PostPosted: Wed Apr 25, 2018 9:15 am    Post subject: Reply with quote

From 4 years of driving my C4S, my experience is :-
In town, achieve about 23mpg (always have Start/Stop engaged).
On fast A-roads/dual carriageways about 27mpg.
On long motorway journies, about 32mpg.

So, 18mpg would seem low, but really depends on the type of driving/route. Worth getting the car checked for any stored faults.
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Raptorace
Newbie


Joined: 13 Mar 2012
Posts: 33



PostPosted: Wed Apr 25, 2018 9:42 am    Post subject: Reply with quote

Thanks guys. Took it in for a check today and apparently all is normal on the diagnostics so I guess it’s just the way it is. I won’t worry about it too much!
 
  
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weejimmy
Spa-Francorchamps


Joined: 26 Mar 2014
Posts: 299
Location: Bucks


PostPosted: Thu Apr 26, 2018 11:07 am    Post subject: Reply with quote

I was always pretty impressed with the economy on my 991.1 C4s. I used to get 23mpg or so around town and easily over 30 on longer journeys. It was night and day better than the e92 M3 it replaced which couldn't break 27 mpg downhill in neutral slip-streaming lorries!

The 991.2 is better again when cruising and in traffic (although only marginally) but drops to a similar level as the 99.1 when 'exercised'.

Another factor might be PDK Vs manual .... and if PDK whether you drive it in manual mode. If you leave them in auto they shift up very quickly to top given half the chance. If you hold lower gears in PDK or have a manual that might account for it.
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Past: 991.1 C4S
 
  
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Zeb
Montreal


Joined: 26 Feb 2008
Posts: 576
Location: Lancashire (on loan from Yorkshire)


PostPosted: Tue May 01, 2018 9:27 am    Post subject: Reply with quote

On a track day at oulton park a few years back I managed a whopping 6.8 mpg from my 997 turbo Surprised so youre clearly not trying hard enough...... Grin
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Tobyone
Monza


Joined: 20 Jan 2018
Posts: 191
Location: Somewhere else


PostPosted: Tue May 01, 2018 9:38 am    Post subject: fuel economy Reply with quote

My 997.1 last week driving to Scotland according to the computer averaged 26mpg virtually all on the motorway at a pretty constant speed ! on cruise control.
Pretty good I thought as I certainly was not doing 56mph for better fuel consumption
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mark pearce
Approved Trader


Joined: 06 May 2004
Posts: 2716
Location: Nationwide


PostPosted: Tue May 01, 2018 10:31 am    Post subject: Reply with quote

I find at motorway speeds 32 mpg is quite easily achievable

once got 40 MPG from a Cayman S at motorways speeds
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forester
Newbie


Joined: 18 Oct 2017
Posts: 6



PostPosted: Sun May 06, 2018 7:59 am    Post subject: Reply with quote

My C2s returns 22/24 mpg around town and
28/32 on a 50/100 mile trip. This is virtually the same as the
Previous C2.
Ps I was on M3 Torque forum with a CSL
And assorted E92 cars! Hi
 
  
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Rob325114
Spa-Francorchamps


Joined: 12 Dec 2015
Posts: 287



PostPosted: Wed May 09, 2018 4:05 pm    Post subject: Reply with quote

I got between 18 and 23mpg on my 997.1, and i'm getting between 26 and 32mpg on my 991.1. I have been extremely impressed with efficiency on the 991.

I would definitely be suspicious of your lower numbers.
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Current: Agate Grey 991.1 C2S Coupe, PDK
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Raptorace
Newbie


Joined: 13 Mar 2012
Posts: 33



PostPosted: Sun May 27, 2018 11:23 pm    Post subject: Reply with quote

Hey guys. Just a quick update on this. I’ve just come back from a European road trip, 3000 miles in 10 days lots of motorway and lots of alpine twisty fun stuff. Over the whole journey I averaged 24mpg.

What’s interesting is I did the same trip last year in my 997.2 in which I averaged 26.5 mpg.

I don’t know how they tested the MPG on the 991 and decided it had much improved MPG, but I guess VW may have been involved, or maybe Dianne Abbott did the calculations 😂😂
 
  
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Magic919
Imola


Joined: 05 Jun 2013
Posts: 826
Location: Berkshire


PostPosted: Mon May 28, 2018 4:56 am    Post subject: Reply with quote

I’ve been taking the 997.2 to Europe for about five years and get 30 mpg and average 52-54 mph. Only varies by about 1 mpg regardless. C4S lower than C2S.

Sounds like quite a drop on the 991.
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weejimmy
Spa-Francorchamps


Joined: 26 Mar 2014
Posts: 299
Location: Bucks


PostPosted: Tue Jun 05, 2018 9:01 pm    Post subject: Reply with quote

Can't reconcile this with my experience over 3 years of ownership. I found the 991.1 surprisingly frugal.
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Past: 991.1 C4S
 
  
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Hamster75
Silverstone


Joined: 07 Sep 2017
Posts: 102
Location: Chester


PostPosted: Tue Jun 05, 2018 9:33 pm    Post subject: Reply with quote

My 997.2 C4 is consistent at 23mpg fast or slow driving doesn't seem to make much difference, I always run Shell Vmax or BP Super, not too bad I think.
 
  
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hornet
Silverstone


Joined: 17 Nov 2009
Posts: 115
Location: Essex


PostPosted: Tue Jun 05, 2018 9:45 pm    Post subject: Reply with quote

Don't know if you guys are using the on-board read out to verify your MPG but my experience with an Audi was that the trip computer was 10% optimistic compared to actual testing filling to brim etc (No surprise there I guess ). Might be worth checking it manually. Very Happy Very Happy
 
  
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MaxA
Suzuka


Joined: 11 Oct 2015
Posts: 1225
Location: Helsinki


PostPosted: Wed Jun 06, 2018 8:14 am    Post subject: Reply with quote

I'd check the fuel consumption manually.

Leaving aside driving style and the auto/sport/sportplus/manual malarkey, let's just say that I find quite a difference between 'winter' (low ambients, lowish speeds, gentle acceleration), 'summer' (higher ambients, higher speeds, more aircon) and Dubai (extreme ambient, very high speeds quite a lot of the time*, cheap/crap fuel, aircon on max). In Dubai I might get 400km/60l tank of super. Here, rather more...

* and I've got the tickets to prove it.
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