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glewis80SC's Avatar
 
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I drive 50 miles one way to work, fwy miles and i average 22/25 mpg with my stock 80SC which i don't think is to bad for a 28 year old car with 170,000 miles.
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Old 05-27-2008, 09:10 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #81 (permalink)
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Quote:
Originally Posted by glewis80SC View Post
I drive 50 miles one way to work, fwy miles and i average 22/25 mpg with my stock 80SC which i don't think is to bad for a 28 year old car with 170,000 miles.
Not bad, but how about a 74 911 w/ 86 3.2 going on 210,000 miles and getting 32/35 on the highway.

.
Old 05-27-2008, 09:28 AM
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Well given the choice I would rather have the power, plus the engine seems to be a lot crisper in all RPM ranges.

Also when I last checked the mileage, it was night driving at 65 MPH which might have given me the higher mileage. Also I think you tend to drive a little harder when all is right with the world, chips and mufflers can do that. It is what it is...
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Old 05-27-2008, 11:07 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #83 (permalink)
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Originally Posted by Mitch Leland View Post
Well given the choice I would rather have the power, plus the engine seems to be a lot crisper in all RPM ranges.
I like mileage too and since I can do it without the performance penalty, but instead, a healthy bump in performance, it's like having your cake and eating it too.

That's the reason I prefer working around the stock chip.

Last edited by stlrj; 05-27-2008 at 12:46 PM..
Old 05-27-2008, 12:14 PM
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Ok after reading this I think I need a major tune up. My 73T with MFI is getting 12-14 MPG. WTF!!!!
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Old 05-27-2008, 08:08 PM
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It's nice to see deacent gas mileage stats....Hmm I don't imagine my project will ever come close to my 06 Jetta TDI Calgary Alberta to Vancover BC mileage wise (one tank with room to spare 970+kms while driving very quickly.. with a Thule ski box on the roof) But I'll bet I could beat my time record If I wanted awesome mileage I'd hop up a Smart Car.. That said I'm also not expecting Corvette mileage from my 911...
Old 05-27-2008, 08:44 PM
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My 73 911S with MFI gets 15 mpg in a combo of city and hwy driving and around 20 tops if all freeway at reasonable speeds (as is no jail time).
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Old 05-27-2008, 09:18 PM
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With my 1982 SC, over the past 57,000 miles I've averaged 19.9 mpg, with a best of 26.8 mpg and a worst of 14.2 when I was fooling with a fuel injection problem. My daily commute is 30 miles each way. mostly with the cruise control set at 70 to 75.

My most recent, 1,000 mile trip with the AC on averaged 22 mpg.

Regards,

Jerry
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Old 05-28-2008, 05:23 AM
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Quote:
Originally Posted by SC-targa View Post
With my 1982 SC, over the past 57,000 miles I've averaged 19.9 mpg, with a best of 26.8 mpg and a worst of 14.2 when I was fooling with a fuel injection problem. My daily commute is 30 miles each way. mostly with the cruise control set at 70 to 75.

My most recent, 1,000 mile trip with the AC on averaged 22 mpg.

Regards,

Jerry

Jerry,

That's the same mileage I use to get before I started making changes to my engine. It's taken me years of trial and error to get where I am today, 33 highway.

Cheers,

Joe
Old 05-28-2008, 05:56 AM
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i usually have alot of mixed driving. averaging 19.7 mpg..... wish it could be better... my best has been 25 and worst at 18, mostly highway driving...... no cruise, maybe an unsteady foot is the culprit?
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Old 05-28-2008, 06:12 AM
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I have owned my 1987 Carrera 3.2 Targa for over 5 years. It has always been fuel efficient. On the HWY, it easily gets 30+ mpg. That is better than my 2008 Volkswagen GTi with a 4 cyl FSi Turbo. To me, this is quite impressive for a 26 year old performance car. With gas prices exceeding $4 per gallon and rising here in SoCal, I am damn glad I have the Carrera.

Come September, I will be usig it as my daily driver again too. Honestly, if it were getting >15 mpg, there is no way I would even consider using it as daily transportation.

Thank you Porsche & Bosch for the Motronic!

Mike
Old 05-28-2008, 07:03 AM
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Just some thoughts.

If one thinks about it most of todays econo cars weigh more than a 911 and I suspect have more frontal area and drag. (C2 & 993's even better).

With EFI on the Carrera including O2 control, it should be a pretty efficient motor at part throttle and cruse.

Tire air pressure, clean air filter, lower restriction exhaust, and a drag reducing spoilers may all even help to some degree.

Wow, telling the spouse that a sport muffler and cat bypass will save on gas should be valid (less back pressure, less drag, more MPG.)

I opted for a Euro Style SW chip w/o O2. I may get less or even more MPG as it dose not use the O2 to fine tune and keep the A/F's where the factory (or tuner) wanted them.

I guess if MPG was the motivation, SW could possibly make a chip that uses the O2 loop to run it a little more on the lean side at cruse. He has a custom option where someone may be able to achive this. It could still put out the HP under WOT.

MFI and carb cars are not expected to be very efficient. CIS was considered a big improvement. O2 or lambda controlled SC's 80-83 should be potentially better or at least closer to each other as to MPG.

The non 02 cars may be adjusted to be leaner or richer depending on goals. Re adjusting the CIS through 79 on a session basis could be considered a good idea as air temp's seem to effect the A/F ratio on these.

$.02
Old 05-28-2008, 07:06 AM
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Spin City started this thread in May 2007. How things have changed since then...

Mike
Old 05-28-2008, 07:13 AM
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Quote:
Originally Posted by MOMO3.2 View Post
Spin City started this thread in May 2007. How things have changed since then...

Mike
Especially the post about gas being a whopping $3.50 per gallon! I've only driven my 911 for one day before one of the BBS rims broke. I think I was getting around 4-5 MPG. First day, fast car, the SPG (smiles per gallon) were MUCH higher.
Old 05-28-2008, 07:28 AM
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Old brake lines are known to swell and creat some brake drag. Might be worth checking.
Old 05-28-2008, 07:30 AM
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Old thread but anyone have mileage stats on a 2.7? My 911s (if my odometer is correct) gets 200 miles on a 3/4 tank.... so thats like 13 miles to the gallon city driving pretty much... must be running very very rich
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Last edited by privatepang; 01-06-2012 at 10:11 AM..
Old 01-06-2012, 10:08 AM
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with my EFI (finally tuned) and SSIs, im up from 24mpg or so on a 350 mile trip to 28.7 this last round speeds between 75-85 mph or so. it runs rich, but the car doesn't like it lean.... 155,000 miles no rebuilds 1980 SC
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Old 01-06-2012, 12:09 PM
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