997 Turbo / GT2 2006–2012 Turbo discussion on the 997 model Porsche 911 Twin Turbo.
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Old Mar 6, 2009 | 08:40 AM
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City mpg

What is everyone averaging in the city. I don't get better then 14-15MPG in the city. On days that I am heavy into the gas I average about 12; has anyone gotten 18 in the city. That is about what I average on the highway!!


I think my car is running rich; What can dealer do to resolve this? What else could be causing my poor fuel economy? My tires are properly inflated and the car has about 13K miles on it now (it's my DD).
 
Old Mar 6, 2009 | 09:04 AM
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I get about 17 in the city.
 
Old Mar 6, 2009 | 09:57 AM
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Originally Posted by Qs997Turbo
What is everyone averaging in the city. I don't get better then 14-15MPG in the city. On days that I am heavy into the gas I average about 12; has anyone gotten 18 in the city. That is about what I average on the highway!!

I don't drive in the city, in the suburbs I get about 17 mpg.

What can dealer do to resolve this?

You won't know until you ask.

What else could be causing my poor fuel economy?

Not getting the car up to operating temperature (i.e. short drives), jack rabbit starts or a similar driving style, a leak in the tank or fuel line. Driving at a high RPM for the conditions. Do you engage the sport mode for city driving? That would tend to encourage a driving style that decreases gas mileage.

On the highway I can get up to 24 MPG, but if I'm having fun in the twisties that drops to 16 MPG real quick, and oil consumption becomes noticeable. Typically on a long drive at freeway speeds I'll get about 20 MPG.

My tires are properly inflated and the car has about 13K miles on it now (it's my DD).
Has your mileage always been like this or is this something you have noticed just recently? If your car was running rich I would expect things like black smoke on start up or heavy acceleration, fouled plugs, etc. Have the dealer check it out for you and if it is running rich you should probably change the oil once you got it corrected.
 
Old Mar 6, 2009 | 10:47 AM
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I've gotten up to 26 MPG on the highway on extended trips. Remarkable for 480hp.
 
Old Mar 6, 2009 | 11:40 AM
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No black smoke under heavy acceleration or start up; I have noticed that sometimes when I start the car the revs jump up to about 3K which is very unsual. It is like someone is giving it gas when starting up. I know My foot is not on the gas pedal. It only does it every once in awhile; Could the throttle be stuck or just extra fuel getting dumped in? The car is also very jeky when manuvering around in 1st gear in the parking garage at work; the throttle seems very sensitive sometimes more so then others.
 
Old Mar 6, 2009 | 12:10 PM
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about 19mpg combined..... close to what my 997S got.... And I have the run will occasionally rev to 3k (first thing in the morning) also.
 

Last edited by summoboy; Mar 12, 2009 at 09:08 AM.
Old Mar 6, 2009 | 01:39 PM
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15.6 in the city with a flashed ecu.
 
Old Mar 6, 2009 | 03:04 PM
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I get about 18 mpg, its pretty darn impressive... maybe have your dealer check your car, I got a shabby 12 mpg with bypass pipes...
 
Old Mar 12, 2009 | 03:44 AM
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i got about 23 mpg on my turbo at one point but my pipes were hella white from running lean.
 
Old Mar 13, 2009 | 05:57 PM
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About 15mpg combined, but almost no 6th gear.

On highway trips up to 26, averaging around 25.
 
Old Mar 14, 2009 | 09:58 AM
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I ve never checked the gas mileage.

I will tho just for ha ha's

25+ on the highway seems unbelievable for this car.. wow,.,, as good as my Toyota.


cab
 
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