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My 82SC did 20-22 mpg in mixed driving. That was pretty much the consensus in the last mpg thread I saw here a while back. My 2.7L Boxster is better-- 26-28 mpg in mixed driving, but uses higher octane gas (93 vs 89 for the SC). On trips, the Boxster will do 33-34 mpg.
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Old 01-14-2008, 06:08 PM
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I got stuck and filled my '85 Carrera with regular 87 octane (I think) did I do any damage? She seemed to run fine until I added premium. Curious.

Scott
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Old 01-14-2008, 06:34 PM
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OK Defcon..is that Bix as in Biderbeck?
Old 01-14-2008, 06:58 PM
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Quote:
Originally Posted by Sapporo Guy View Post
hmmm, ugh ....
I get 5.5 km per litre ... something is wrong... about 20mpg
lolo, I do bring it up past 5,000 per start and don't really drive much over the 50 kph limits in town ... now what gives?
I've only checked my mileage once, pure interstate driving, steady at 80-90 mph for 500 miles when I calculated 27 mpg. I rarely take my car on the interstate highways, and assure you that I get NOWHERE close to that with my "typical driving style" on the twisty back roads that I frequent. I don't know what the mpg is under those conditions (and don't really care ), but I'd bet it's probably a lot closer to what you get or lower.
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Old 01-15-2008, 02:41 AM
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I just did a trip to Reno from the bay area in my 74 911 w/86 3.2 and used 6.5 gallons in 208 miles which came out to 32 mpgs.

On the way back I stopped by Carson City and returned on highway 50, using 6.7 gallons in 235 miles for 35 mpgs. Total for the round trip was 33 mpgs at 70+ mph.


Cheers,

Joe
74 911 86 3.2 w/ GM Multec injectors, 0.060" plug gaps, 225/60/16 tires, 87 octane, .76 5th gear ratio on 3.875 R&P.

Last edited by stlrj; 05-26-2008 at 08:32 PM..
Old 05-26-2008, 08:26 PM
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Originally Posted by Noah930 View Post
Trundling along at around 70 mph, my stock 930 averaged 24 mpg from Portland to L.A. For a 21-gallon tank, that worked out to about 500 miles/tankful. Of course, that meant I also got passed by Prius', who were probably still getting better gas mileage.
Have you checked your AFR's ?? I'd be worried about running too lean at that kind of MPG
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Old 05-26-2008, 08:46 PM
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Have you checked your AFR's ?? I'd be worried about running too lean at that kind of MPG
I'm not too worried about that since I have the 02 sensor connected ( 4 wire NTK sensor) and it seems to be doing it's job. My engine also runs quite cool considering I only have a trombone fender oil cooler.

I figure I'm getting at least 600+ miles per tank.

Last edited by stlrj; 05-26-2008 at 09:04 PM..
Old 05-26-2008, 08:56 PM
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I was directing that to Noah,,, non-turbo guys it's not a problem, but he's got a 930
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Old 05-26-2008, 09:01 PM
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I was directing that to Noah,,, non-turbo guys it's not a problem, but he's got a 930
Oh. My mistake.
Old 05-26-2008, 09:05 PM
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I have a 1970 914-6. I use the drive to the coast to check mileage. It has a 2.0 liter engine with weber carbs, and it gets about 16-18 miles per gallon. I have to fill up once to get back home w/ 15 gallon tank, and about 360 mile round trip.

The 911SC with a 3.0 liter with CIS gets about 22-25 mpg, still not so great.

The 3.2 with DME gets about 28-31 mpg, depending on traffic, weather, etc.. I recently discovered that my mileage was way low, around 25-27 mpg. I fixed some vacuum leaks, did the Seafoam thing, adjusted the valves, and now the mpg is way up, back to the very high 20s, and the engine accelerates better and smoother.

I usually drive at night, since driving during the day means more traffic and you don't get to see the awesome moonlit valleys and mountains on the way to the coast.
Old 05-26-2008, 10:03 PM
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That is true - if your car can run on 87 octane you don't get any benefit of running on 91. My 350 V8 chevy runs fine on regular, it's actually what the owners manual recommends. But the owners manual for my '86 says 92 octane minimum so I run on premium.
Yeh, but I bet dollars to doughnuts it's quoting 92 RON, which is how Euro gas is rated.

US gas ratings are (MON+RON)/2, which is usually 6-7 lower.

Otherwise, there wouldn't be a RoW 930 motor left running on the West Coast - 930/60 motors need 98 octane (RON). That's just premium gas.
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Old 05-26-2008, 10:09 PM
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umm.. this seem to be a little odd base on my experience and others posted. Mine is also a 3.2, 88 carrera, and no matter how I drive, the best I got out of it is around 21, 22 mpg even after a tune up. Unless your less weight 74 body makes that much different.

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Originally Posted by stlrj View Post
I'm not too worried about that since I have the 02 sensor connected ( 4 wire NTK sensor) and it seems to be doing it's job. My engine also runs quite cool considering I only have a trombone fender oil cooler.

I figure I'm getting at least 600+ miles per tank.
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Old 05-26-2008, 10:58 PM
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Thumbs up

Yep I'm in there as well, on my last trip of 2500 miles across France and Germany I was getting 28 mpg at a speeds under 95 mph, but when going at around 120-130 mph it went down to about 15 to 18 mpg. But still not bad for a 22 year old car.
Old 05-26-2008, 11:53 PM
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umm.. this seem to be a little odd base on my experience and others posted. Mine is also a 3.2, 88 carrera, and no matter how I drive, the best I got out of it is around 21, 22 mpg even after a tune up. Unless your less weight 74 body makes that much different.
It has nothing to do with the weight but the small modifications I have made to my engine/transmission/tires that anyone can do to get that mileage.

You are right, a regular tuneup is just not enough.

74 911 86 3.2 w/ GM Multec injectors, 0.060" plug gaps, 225/60/16 tires, 87 octane, .76 5th gear ratio on 3.875 R&P.


Cheers,

Joe
Old 05-27-2008, 06:21 AM
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I don't have solid proof, but I was getting nearly 30 MPG on the road before installing a sport muffler and a SW chip. Now it's about 23 MPG on the road. No question the car has more beans than before. I've never made it my life's work to document this very carefully, but that is what I'm getting now. Could this be the case?
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Old 05-27-2008, 08:00 AM
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Oh ok, I double checked your last post and yes you posted the statement below but I simply didn't read it carefully. Thanks.
but does that mean you loose power? Is it noticeable?

Quote:
Originally Posted by stlrj View Post
It has nothing to do with the weight but the small modifications I have made to my engine/transmission/tires that anyone can do to get that mileage.

You are right, a regular tuneup is just not enough.

74 911 86 3.2 w/ GM Multec injectors, 0.060" plug gaps, 225/60/16 tires, 87 octane, .76 5th gear ratio on 3.875 R&P.


Cheers,

Joe
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Old 05-27-2008, 08:25 AM
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Most people claim that chip and exhaust help MPG. On my previous cars, include german and Japanese cars, I experienced lost of MPG too. Gain power? Maybe.

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Originally Posted by Mitch Leland View Post
I don't have solid proof, but I was getting nearly 30 MPG on the road before installing a sport muffler and a SW chip. Now it's about 23 MPG on the road. No question the car has more beans than before. I've never made it my life's work to document this very carefully, but that is what I'm getting now. Could this be the case?
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Old 05-27-2008, 08:30 AM
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Oh ok, I double checked your last post and yes you posted the statement below but I simply didn't read it carefully. Thanks.
but does that mean you loose power? Is it noticeable?
Quite the contrary which is surprising to me too. More torque and power throughout the rpm range. Seems that when my gas mileage goes up, so does performance, making it a lot more fun to drive too.

Even with the higher gearing due to the higher profile tires, I still find myself taking off in 2nd gear with so much extra low end torque.

Last edited by stlrj; 05-27-2008 at 08:40 AM..
Old 05-27-2008, 08:35 AM
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Most people claim that chip and exhaust help MPG. On my previous cars, include german and Japanese cars, I experienced lost of MPG too. Gain power? Maybe.
That's why I use the stock chip and do all my performance modifications around that.

Porsche left a lot on the table, all right, but I don't think it was the software.

Last edited by stlrj; 05-27-2008 at 08:54 AM..
Old 05-27-2008, 08:43 AM
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Originally Posted by rusnak View Post
The 3.2 with DME gets about 28-31 mpg, depending on traffic, weather, etc.. I recently discovered that my mileage was way low, around 25-27 mpg. I fixed some vacuum leaks, did the Seafoam thing, adjusted the valves, and now the mpg is way up, back to the very high 20s, and the engine accelerates better and smoother.
I agree. When it's running right, performance and mileage go up together.
Old 05-27-2008, 09:01 AM
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