Depends how many miles you have on the car. About the only real service item that could improve the efficiency is changing spark plugs - AFAIK. If you were also getting maybe 10 mpg around town, it would be a sign that something is really not working up to par. That's why I'm wondering if people really turn a minimum of 18 mpg, because I'm way below that.

Porsche recommended plug change is at 60k, I think, but some dealers do it early if customers complain of rough running.

 

Well, I did not yet drive it long enough to collect good stats. it is quite difficult to analyze MPG fluctuations, it may be tires, open windows, spark plugs, dirty oil, who knows what else...

I am not getting 10 mpg around town, no way. Average in 'continuous' was sitting in area of 16 something and it included all previous bursts and runs at 5-7K RPMs. But thanks, I will keep an eye on this issue now.

Too bad spark plugs on this engine sit in somewhat completely awkward place, I probably will not be able to reach `em at all. And I will have no time to get to shop this week to get em replaced. Probably will do in in the fall together with oil change, on a car with 42K miles it is due anyway I guess.

 

I was getting an average on 20mpg with my supercharged 997S tip!. That is the same I'm getting with my current 997TT. Plugs (and coils) on the 997 aren't that hard to replace - i did it once and it took about 2 hours. On the 997TT, I probably would not attempt it.

 

I guess with 42k miles, plugs might improve the mileage. I hesitate a bit, since that is often recommended as a "cure all" that doesn't really improve anything. I have my car in for service today. I may watch the mileage for a while, but I'll ask them what I should be seeing for mileage and report back.

 

Thanks, if they could say, roughly, how much engine should eat at 3k, 4K, 5k RPMs - that would be a good starting point perhaps.

 

When I drove the car back after buying her, all freeway driving around 70 mph, I got a tick over 26 mpg.

 

Just drove my kid to in-laws, same route as yesterday, got 20.2 MPG. Difference was - I turned off AC yesterday as it cooled down a bit and drove with windows open.
So, with AC I get 17.7 average, without it - 20.2. I would say it is a bit more than usual but in pretty same ballpark with my Lexus - about of 2 MPG diff for AC unit to run. So everything seems to be normal I guess.

 

I am experiencing under 20 mpg. It really depends on how you drive though (eg sports mode, highway cruising)

 

I avg. about 15mpg City/24 highway..I figure why race to the back of someones car

 

I haven't heard back from the dealer yet. I know in 6th, I get well over 20. Combined city hwy I'm getting only 14. But I think the sport button has a lot to do with mileage. Probably more than the A/C.

 

The nice thing about the 997.2 with PDK is it lets you drive how you want to... put in automatic and apparently get pretty darn good gas mileage... or put in manual sport, upshift at 5500+ RPM, drive hard, and get "who cares" MPG ! With a Camry you don't get to choose.

 

I am with you. my round trip commute is 140miles. After a battery replacement last night and reset. I got 24.1mpg on the way in this morning. I have been getting around 19mpg. 70 miles to work. 50% hwy (15S) cruise control on 80mph. 50% twisties (Del Dios Hwy) Escondido to 5S. And it's my 2nd day on this last fill up and says I can still do 187 miles. I am very happy with this car. If I want to have fun I have the option to press the throttle harder, shift later etc, but if I want to conserve the option does exist.

 

I will drive all the way home tonight with Sport mode off (it will be hard) and report when I get home if there is a difference.

 

Mileage can be highly dependent on the gas you use. Lower octane and higher ethanol content
can both reduce your mileage. On the highway I can easily get 25 MPG or better at 60-70 with cruise control on in 6th .In town 15 -16 if I don't push it too hard and don't hit the sport button too often. Having tried several premium brands I get best mileage on BP/Amoco premium 93 octane.

 

my current average is about 15.6