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jhubs's Avatar
 
Join Date: Sep 2006
Location: Fort Collins, Colorado
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I purchased my 87 in November and drove from DC to Colorado. Averaged 23 MPG over 2071 miles.
Installed Steve Wong Chip, put a right side second hole in the stock muffler.
Traveled from Ft. Collins, CO to Moab, Ut and back 3 weeks ago and averaged 28 MPG. Same wife and same luggage as DC trip!
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1995 993 Carrera, Guards Red Coupe (current)
1987 911 Carrera, Marine Blau Metallic (06-08) Gone but...
1965 Yellow Mustang Convertible (65-05)
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It is always a good idea to keep the pointy end going forward as much as possible.
Old 05-31-2007, 09:43 PM
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The key to economy is keeping your foot out of it. With premium at 3.50 dollars per gallion, shifting when the little yellow triangle lights up works. Instead of shifting at 3000 shift at 2000. On level ground, 3.2 liter engine runs down to 2000 rpm in 5th.
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1987 Carrera 3.2
Old 05-31-2007, 11:47 PM
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I have been getting around 25-29 on the highway in an '88 3.2L
The Steve Wong chip claims to improve gas mileage. If this is true and gas at above $3.20 a gallon, it would be worth getting the chip based on gas savings alone. The gain in driveability/performance would also be a nice benefit.
Old 06-01-2007, 05:47 AM
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Join Date: Jan 2006
Location: Denmark
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I used to get 15 mpg, but after I got my Webers tuned I get 25 mpg. Its a 911T 2.0
Old 06-01-2007, 06:16 AM
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Quote:
Originally posted by sig_a
The key to economy is keeping your foot out of it. With premium at 3.50 dollars per gallion, shifting when the little yellow triangle lights up works. Instead of shifting at 3000 shift at 2000. On level ground, 3.2 liter engine runs down to 2000 rpm in 5th.
Don't shift that low. The owners manual for my '88 listed minimum shift points, which were about 2500 rpm. Since those were minimum shift points, I'd recommend never shifting lower than that.

You could get up to 3000 rpm if you accel a bit slower. Just don't go to 4500 if you are looking for fuel economy.
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Old 06-01-2007, 07:20 AM
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In 50/50 city/highway driving, my 911 is returning about about 23-24 mpg. I was really shocked at that number because I'm pretty sure that the car is running rich. It runs fine on 87 octane, as well.

My 944 was a mileage champ...I'd regularly get around 30 mpg on regular unleaded.
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1977 Porsche 911S
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Old 06-01-2007, 07:42 AM
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I'd like to ask what RPM your 3.2s run at on the highway going 65 MPH?

My 3.0 w/ PMOs had the timing adjusted last fall and I seem to be getting worse milage. But I havn't really been able to know MPG exactly since my speedo was way off. Just got the speedo back from North Hollywood and it's dead nuts on. My first tank full and relatively mild mannered driving gave me 17.9 MPG. I'll be curious what it gets on a trip. With a 901 trans and 50 series tires, the engine turns 3100 RPM at 60 MPH. Which brings me back to the original question since I'm thinking about a taller 5th gear.
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Last edited by joetiii; 06-01-2007 at 12:49 PM..
Old 06-01-2007, 12:46 PM
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Quote:
Originally posted by gtihop
My 83 SC gets horrible gas mileage. And at $1.19 per liter for cheap gas , this isn't good. Needs to be set up a little better.
Let me know if you figure it out. My 83 cab gets between 17 and 22 depending on what grade of gas I use. I don't care that much, but I just think it ought to be closer to the 25.
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Old 06-01-2007, 01:29 PM
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my 84 911 carrera logs look like this

305 miles fillup with 18.88 gallons 16.15 mpg

238 miles fillup with 13.51 gallons 17.61 mpg

208 miles fillup with 8.83 gallons all highway for 23.6 mpg

274 miles fillup with 14.62 gallons 18.74 put in Lucas gas treatment.

325 miles fillup with 15.49 gallons 21 mpg put in Lucas gas treatment.

339.2 miles fillup with 18.3 gallons 18.52 mpg

328.5 miles fillup with 18.6 gallons 17.66 mpg

358 miles fillup with 19.4 gallons 18.45 mpg
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Old 06-01-2007, 02:39 PM
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The SCs can run on 87 oct., where electronic fuel injection reqs. premium. Here in my town the difference in price between the 2 is about 30 cents a gallon. $3.23-$3.56.
Fortunately my wife's and I's daily drivers are diesels which here runs $3.05 a gallon.
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Old 06-01-2007, 05:54 PM
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I was reading somewhere that putting higher grade gas in our car is not a treat...it's a waste of money. It was just a editorial, so the claims can't be _that_ accurate. Just wondering, should I keep putting in high test (93) into an '87?
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Old 06-01-2007, 07:33 PM
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Quote:
Originally posted by Kaliv
I was reading somewhere that putting higher grade gas in our car is not a treat...it's a waste of money. It was just a editorial, so the claims can't be _that_ accurate. Just wondering, should I keep putting in high test (93) into an '87?
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.
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Old 06-02-2007, 05:41 AM
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I put in 3-3.5 gal of gas for 8-12 AX passes....maybe 6-8 miles.
I ain't doin' the math.
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Early Boxster
Old 06-02-2007, 06:06 AM
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Quote:
Originally posted by masraum
Don't shift that low. The owners manual for my '88 listed minimum shift points, which were about 2500 rpm. Since those were minimum shift points, I'd recommend never shifting lower than that.

You could get up to 3000 rpm if you accel a bit slower. Just don't go to 4500 if you are looking for fuel economy.
Your recommended minimum shift points at 2500 RPM disagrees with Porsche's CASIS system, which indicates upshifting much earlier in the power band. That said, its much easier to upshift at 3000 rpm than 2000 rpm. But once that becomes routine, there's no ill effect to engine or drive train. In addition, conservation has a huge up-side.
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Old 06-03-2007, 01:54 AM
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As a good friend asked me one time, Did you really buy a car like that for mileage?
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Old 06-03-2007, 08:14 PM
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My response is no. If I buy something for gas mileage, I would buy a civic or a sentra. I buy this car for what I like but I would like to know about my car so that if there is anything wrong, and if I can fix it to get better gas mileage with the same (or maybe even better) performance, I'll be happier.
I believe most of these guys are having the same thought. Especially reading what Spin City stated at the begining "I didn't get a 911 to be economical, but I was very surprised when... Gotta love the 911....."
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Old 06-03-2007, 10:30 PM
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23.5 mpg. Mostly highway.

SW chip didnīt get me better mileage, but that is perhaps because itīs more fun to drive her harder with the chip.
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Old 06-03-2007, 11:56 PM
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Okay this got me thinking. I ve been putting the highest octane available in my Euro 78 SC since I got it a few years ago. I believe my Euro has a different compression ratio than a US model. Have I been throwing money away?
Which gas should I run?

Thanks!
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Old 06-04-2007, 06:05 AM
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Quote:
Originally posted by joetiii
I'd like to ask what RPM your 3.2s run at on the highway going 65 MPH?....
I've only checked my gas mileage once (curiosity got the best of me). Over a full tank of gas, 100% interstate, averaging 80-90 mph, I got right at 27 mpg. 30 mpg would probably be attainable if I drove in "economy mode", but it is a sports car after all . In 5th gear, I seem to recall the tach being in the 3.5K range at approx. 80 mph.
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Old 06-04-2007, 06:22 AM
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Mine runs right on 3K at 80MPH, of course I rarely get to the speed, NOT!!!
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84' Factory Turbo Look M-491 (gone but not forgoten)
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Old 06-04-2007, 09:14 AM
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