Jump to content

The RennTech.org community is Member supported!  Please consider an ANNUAL donation to help keep this site operating.
Click here to Donate

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)
Sign in to follow this  
nine11

997C4S (X51) Fuel Consumption

Recommended Posts

Can anybody advise on expected fuel consumption for 997 C4S (X51)? My calculations are nothing like any specification that I have read... it is definitely between 10 and 15 mpg. In one fill it was less than 10mpg for the tank. It is relatively new (800km). I have done individual tank fill calculations and totalised what has gone in (less start/end) vs kms. Every now and again it splutters, it is so abrupt and raw! I drive quite hard (fast) and enjoy accelerating in/out corners. Love the sound. Is the fuel consumption expected or will it get better? Any idea how long rear tyres should last if driven hard. I am getting worried about those too. After 800km the outside edges are looking considerably worn.

Share this post


Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.

Hi,

I usally get about 18MPG with my stock 997S. On

the track I get about 6.1MPG and I have had it down

to 5.9MPG.

Trying to decide what is normal is very difficult with

these high horsepower cars.

Paul

Share this post


Link to post
Share on other sites

Remember that the mileage listed is compiled in near lab conditions to optimize the rating. With your driving habits and mine as well, expect 25-40 % less than advertised. It takes a lot more energy to accelerate a car to 100 mph than it does to keep it there. Take it to the track and get 5-7 mpg, you will feel a little better on the road.

J. Greer

Share this post


Link to post
Share on other sites

~18 is typical except on interstates where I can exceed 20-22.

Watch your rear tires carefully at around 10,000 miles or less. Check the *inside* wear as the camber is set up for racing and my tires, at least, wore unevenly after dominantly cross-country driving. Unless you have the car up on a lift it is hard to see the inside treads -- so reach your hand in and feel the treads!

Share this post


Link to post
Share on other sites

It really depends on how hard you're driving it. These engines can get 25 mpg highway if you set the cruise control at 65 mph. In town with conservative driving in traffic, expect 18 mpg.

If you're constantly stomping the pedal, don't expect better than 12 mpg.

Share this post


Link to post
Share on other sites

From Jackson, MS to Dallas, TX (400mi) recently I averaged 71mph and got 26mpg (both according to the PCM)

It really depends on how hard you're driving it. These engines can get 25 mpg highway if you set the cruise control at 65 mph. In town with conservative driving in traffic, expect 18 mpg.

If you're constantly stomping the pedal, don't expect better than 12 mpg.

Share this post


Link to post
Share on other sites

Thanks for the feedback. I initially calculated 6mpg but thought I must have got it wrong so didn't post it. I clearly have been bad.

Share this post


Link to post
Share on other sites

Can anybody kindly advise on resetting the fuel consumption computer? I have Sports Chrono. The MasterTech pulled/pushed a lever on the column which reset it but I don't know what menu option he was in.

Share this post


Link to post
Share on other sites

2006 C4S X51. Six speed. Approx 15 mpg in town. 25 on the highway at 76 MPH average speed. Could get more in town if I worked at it.

Reset the dash MPG by adjusting the lower left lever until the average MPG shows and then pull it straight back and hold until the reset occurs. Can do likewise with the average MPH as well.

Edited by sclemmons

Share this post


Link to post
Share on other sites
Reset the dash MPG by adjusting the lower left lever until the average MPG shows and then pull it straight back and hold until the reset occurs. Can do likewise with the average MPH as well.

I think you mean to say pull it straight forward.

Share this post


Link to post
Share on other sites
I drive quite hard (fast) and enjoy accelerating in/out corners. Love the sound. Is the fuel consumption expected or will it get better? Any idea how long rear tyres should last if driven hard. I am getting worried about those too. After 800km the outside edges are looking considerably worn.

Did you do a proper engine break in process?

Share this post


Link to post
Share on other sites

I push the shifter forward into first, pull it back into second. Doesn't everybody? It sound odds to me to push back into first and pull forward into second. I pull the MPG reset in the same direction as second, "back", if that helps you.

Reset the dash MPG by adjusting the lower left lever until the average MPG shows and then pull it straight back and hold until the reset occurs. Can do likewise with the average MPH as well.

I think you mean to say pull it straight forward.

Edited by sclemmons

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.