Canyon56

Hmmm. This is interesting to read. I've been contemplating selling my 1996 993 C4S, my 2002 E46 BMW, and my 2009 E63 AMG, and getting a new 997.2 to have only one car now as a decent, fun to drive daily.

Part of that reasoning was the idea that the 997 had pretty decent gas mileage for the sort of car it is. But my 507 hp heavy weight AMG sedan gets the same kind of mileage that you guys are posting here.

Aggressive to the point of tire smoke=10-12
Normal city driving=14-17 (even 19 in C mode and with a light right foot)
Highway at 75-80 mph=23-24

So I guess I should cross off fuel economy as a factor in my decision making

Yeah, of course I realize the choice isn't all about gas mileage, but I like the E63 as a daily and part of my rationale is not only to stay with Porsche but conserve a bit of fuel use, too.

p-cardriver

997.1S
Low 20s commuting a mix of interstate and city streets.
just did a trip 350 miles each way A/C on most of the way speeds 70-78 with some construction delays, averaged over 27 MPG
track < 8 MPG
pure city (rare) 18-19 MPG.

As you can see, I save most of my more aggressive driving for the track and it shows in the fuel economy.

mdrobc1213

Just relocated my car to SW about a 1500 mile trip and I got about 27-29 mph overall on basically 2 lane divided hwy driving. In the city I usually get about 17-18mph mixed maybe 20mpg. If I am on it in sport mode or sport plus about 15mpg. PDK car. So far very satisfied with it. Check out the snapshot.

ADias

A 997.2 gets 27MPG+ under those conditions - a 20% improvement! PDK should do even better.

Canyon56

Yeah, I hear you. I'm planning on a PDK, too. But I actually don't do that much freeway driving, and this will be a DD. So it sounds like kinda the same mpg if used as a city/back road/highway DD.

But I know it really shouldn't enter into the decision. It's just that I do like the E63 as a daily and love that torque. But since I have to get life down to one car and dump the 993, I'm not sure I could live properly without a P-car.

Macster

Filled up my 996 Turbo's gas tank this AM. Engine not fully warmed up. Drove nearly 17 miles in town, running errands. Lots of stop and go. Several short trips with of course requiring engine starts.

I noticed once engine warmed up I was shifting from 1st to 2nd at around 3500 rpms. Then shifting into successively higher gears at under 3K and cruising at 2K. Which gear I had the transmission in depended upon the speed limit in force on the road where I was driving. I used 3rd for 25mph zones, 3rd or 4th for 35mph and 5th for a 45mph zone.

Oh, a bit of a side track: I remember when I had my 06 GTO with its instantaneous fuel mileage display that driving at a steady speed on flat ground depending upon which gear I had the transmission in and thus at what RPM the engine was turning had a big effect on fuel consumption.

I can't remember the exact numbers now but roughly from best case -- say 5th or 6th gear at around 1600 or a bit higher rpms to worst case of 3rd gear or even 2nd gear at I don't know what rpms -- would have the instantaneous fuel consumption reading going from a nice 30+mpg down to half that. Also, I remember under moderate acceleration from stop starting out of course in 1st gear and then shifting up the gears until the speed limit required I throttle back could have the instantaneous fuel consumptiion reading in the single digits (6mpg or even a bit less!) for a while.

Anyhow, fuel mileage under the conditions I described above for my 996 (0E) Turbo was 16.1mpg.

Sincerely,

Macster.

akw

I've got an '08 C4S. I get comparable mileage to what you describe. I shift at about the same point on the streets as well.

Highway on cruise I've been able to get 28 mpg (once). The rest of the time it's 23-26 mpg on highway with cruise.

I wouldn't worry about your car in the context of something being wrong. I don't think anything is wrong with your car.