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The mpg shown in the display NEVER matches what I calculate each time I fill up. It always shows better mileage that what I actually get. This also was the case on my Cayman and on my 911.
I'll second that - the onboard mpg computer is worthless. It always shows better than actual.
I drive the same speeds and what you are getting beats what I get on a '18 model 'S' model with Cobb AP.. I get 2 - 2.5 MPG less with the ski box on top. Last around town measurement was 14.93 MPG w/o ski box. Generally I use comfort setting but use the paddle shifters quite a bit to keep the RPM up for hill climbing.
My last fill up today from around town driving was 10.75 MPG. Just awful.
Not sure with regard to your driving style, but I did a 5,000 mile road trip over the summer in my 18 Macan S. Driving through the southwest in particular, looking at driving for hours and hours at 85+. Still managed to get 22+mpg.
"The mpg shown in the display NEVER matches what I calculate each time I fill up. It always shows better mileage that what I actually get. This also was the case on my Cayman and on my 911."
- mvmojo
YMMV, obviously, but my Macan PCM trip computer calulates MPG accurately.
I am a commercial and military pilot, and am conversant with computing distance divided by consumed fuel.
The PMC mileage is not exact, but it is within 10% of my manual MPG calculations.
Same experience with my 2011 997 GTS. Trip computer error is < 10% versus my calculated values.
Last edited by Liste-Renn; 11-07-2021 at 04:04 AM.
I just drove into Chicago to get the oil changed with a Macan S (over 400 mi roundrip) and got about 19 mpg on the highway. Part of it was in a gale force wind and rain, but I would agree, the mpg is abysmal. It used to be that a Porsche was the most fuel efficient in its class, but now they seem to be the least efficient. I was also shocked about the terrible mpg. I can easily beat the mpg with Porsche sports cars, but I've yet to even come close to the EPA highway mileage.
I just drove into Chicago to get the oil changed with a Macan S (over 400 mi roundrip) and got about 19 mpg on the highway. Part of it was in a gale force wind and rain, but I would agree, the mpg is abysmal. It used to be that a Porsche was the most fuel efficient in its class, but now they seem to be the least efficient. I was also shocked about the terrible mpg. I can easily beat the mpg with Porsche sports cars, but I've yet to even come close to the EPA highway mileage.
I'm thinking that a few tools and a little discomfort reaching to remove the tray and changing the oil and filter sure beats a 400 mile round trip to Chicago.
Our 2021 turbo seems to be tracking the 2016 Cayenne base that we sold. Our PCM average is about 19 over 7k miles. We routinely get 23-24 cruising 75-85 in the turbo. The cruising numbers are normal mode, low suspension. There is a significant penalty for using sport mode (or sport plus) because of the PDK mapping. It makes a huge difference when the transmission holds a lower gear longer. In normal mode you have a computer program the upshifts early, coasts, etc.
Without knowing how you’ve set up the car or how you drive it’s hard to tell what you’re doing “wrong”. But if you drive in sport mode or turn off the start/stop, have a heavier foot off the line, use the accelerator more aggressively when starting or when passing on 4-lane highways your mileage will drop. A lot.
We used to get 28+ on our 2013 Boxster S. We routinely got over 26/27 on our 2013 C2s and 2014 C4S. Our Cayenne had a “lifetime average” of 19+ over 60k miles. The one thing I’ve learned re fuel economy from all these Porsche seat-miles is that every car is extremely sensitive to driving style. Normal mode, gentle acceleration, etc - “wow!”. Sport/Sport plus (manual shifting), spirited driving - “wow!” In the other direction.
I get my best fuel economy at 75-90 mph on interstates with lowered suspension setting and normal PDK setting. 20-22mpg:
Pushing SPORT or SPORT+ halves that, as does passing with PDK kick-down acceleration activation.
Canyon carving yields 12-14 mpg, if uphill or requiring passing maneuvers, it can be less than 10 mpg!
All that said, I am happy with the performance/economy balance of my 2018 Macan GTS.
Gotta pay to play.
It’s a big box sitting high with a fun suspension, transmission and drive train.
The engine provides just enough power to be all things to all people- but you will pay at the pump if you want sports car performance.
If you bought a Macan S, GTS or turbo expecting fuel economy, you chose the wrong vehicle.
11-02-2021 | 04:53 PM
