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Raptorace
Newbie


Joined: 13 Mar 2012
Posts: 32



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
Reims


Joined: 23 Jul 2014
Posts: 4289
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: 32



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
Donnington
Donnington


Joined: 05 Dec 2015
Posts: 12828
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: 71
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: 1338
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: 32



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: 284
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: 568
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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991 C4S
 
  
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Tobyone
Monza


Joined: 20 Jan 2018
Posts: 153
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: 2673
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: 5



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: 284



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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