On European forums I read reports of rather diverse average fuel consumptions (between 14 and 27mpg). Particularly surprising are some comments from non-S 997 and 997.2 drivers, who still own them but also own a new 3.4l 991, that the new cars consume significantly more fuel under very similar driving conditions.

It would be interesting to collect some data from our members.


Regards, Rainer

 

991S, PDK here. Don't check mpg very often but on a recent 900 mile jaunt, checked it for the hell of it and recorded just under 31 out and 29.6 on the way back, averaged 75-80 mph.
I have the on/off start disabled at startup and around town the sport button is always engaged.
Not sure what city-highway ave. mileage is.
Going on another 400-500 mile cruise tomorrow so we'll see what she does.
Didn't really buy the car for gas mileage but look at good fuel consumption as a nice bonus.

 

I get about 26-28 on the highway and 8-10 on the track.

 

Sorry that I can't chime in with my own initial results as of yet, but I heard today that the delivery of my new 991 has been delayed presumably until July 27
Until then, this might help ... a little

 

Yah, and the Cayman in the driveway!

 

Don't think that is true - not if all things driving are equal.

The only case where the 991 will use potentially, slightly more fuel is if you have PDCC.
In that case the power steering hydraulic pump is fitted to the engine and runs continuously as the engine is running. This means it needs a little extra power from the engine so now the electric steering which is marketed as a "fuel saver" uses power in addition to the hydraulic system - the net total would mean that you need a little more gas compared to the non-PDCC car. But the difference is not going to break the bank...

Rainier

 

Excellent wheel/body color combination CarManDSL!!

Rainier_991, I understand, but I don't believe that this is the issue those reports are touching on. Most of the reporting 991 owners are "Porsche experienced", i.e., had previous models. Some are very surprised about a significant increase (sometimes 20% higher fuel consumption than before) under pretty much the same driving conditions (near identical daily city/highway mix for daily drivers and typically the same driving style).

My intention when starting this thread was to see if we can collect more data samples to either validate or invalidate these statements.

Greetings, Rainer

 

Does it really matter?
It's a sports car subject to many more variables in driving than a DD so there is no way to "validate"
statements of MPG to make a generalization.

 

Hence the widely disparate mpg reports, I'm sure. Anyone getting "good" mileage needs to give their car to someone who'd going to drive it properly!

Also, I'm surprised you're getting such good mileage on the track. I thought 4-5mpg was norm for pretty much any car in this displacement range.

 

I am ordering a 991 Carrera 3.4 this week, and i have read about it that City mpg goes 19-20 mpg. Is this real?
Actually i use a Audi Q7 3.6 for every day car, and soon replacing with 991, because Q7 is making me crazy. Average city fuel consumption is 10-11 mpg. Plus i am not a "aggressive" driver, driving car fast or stuff like this.

What do you people think? Will 991 save me spending a lot for fuel ?

P.S. I live in Germany, i converted L/Km to MPG

 

I have not reset my fuel comsumption since purchase at 2800 miles Im at 13.3 now. 991s pdk daily driver ny metro some highway weekends

frame of reference last car 997.2s pdk 12.9 for 22000 miles

the audi will start to look good!

everyone go out to their pcm and read out your latest reading

 

I'm always a little perplexed about conversations regarding the cost of fuel for cars that cost >$100k. In the greater scheme of things, is it significant? If the cost of something like fuel really bothered me, I'd be buying a 5 year old diesel VW Golf or a 30 year old MB W123 to run on waste cooking oil/biodiesel.

Unless someone else is paying for all the 991 costs (note, maintenance etc.) except fuel or you are putting intergalactic travel miles on it, fuel is really a small piece of the total cost of ownership.

 

I am excited about the better-by-engineering aspect of better fuel economy.

 

I typically average a bit better than that in my 991 S. If you behave I would bet the 3.4 will do at least as well.

But beware- the 3.4 going up the rev scale is totally addictive...

 

I don't know how much you use your 991, or if you use it everyday.

Personally, with Q7, everyday home-work trip for me is like 170-180km. 70% of trip is city road, 30% highway. Lets take 175km as average: 5 days a week X 175km = 875km/week. That's 270-280€ fuel per week.
This is my 4th year of this everyday 175km trip. For this everyday "trip" i drove cars like: Nissan GT-R, Ferrari 360, Audi RS4, Maserati Quattroporte, Shelby GT500. So that means I paid A LOT money for fuel, for 4 years