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-   Porsche 911 Technical Forum (http://forums.pelicanparts.com/porsche-911-technical-forum/)
-   -   911 mpg (http://forums.pelicanparts.com/porsche-911-technical-forum/616227-911-mpg.html)

ivangene 09-17-2011 07:04 AM
very timely thread... I have been trying like hell to get better milage, I normally average about 16-17 but this last tank was really bad,.....I almost got 22!!!

WTH - I must be p@ssy footin around....there aint NO WAY I will stand for that - I hope to be SUB TEEN this next tank....


I didnt buy it for MPG!

Eagledriver 09-18-2011 07:12 PM
Quote:
Originally Posted by redstrosekNic (Post 6257017)
While you are correct, it would make sense for fuel consumption to rise, ceteris paribus, with the return of a factory air box or filter. While the fuel injection delivers less fuel to go with the smaller amount of air, the engine will have to work harder to achieve the same acceleration that it did with a more breathable air box and filter. Because the engine needs to work harder, it will use more fuel. It can be compared to an air compressor using less power when it is fed 240 volts, as opposed to 120. The compressor isn't stressing the power supply as much when there is more to spare.
The engine will work just as hard either way for a given acceleration and cruise speed. If the engine were "working harder", the car would be going faster or accelerating harder. If the air filter is restrictive the driver will push the pedal down a little more to let in the same amount of air and therefore the same amount of fuel. What makes you think there is a power difference for an air compressor at different voltages? Electric power is measured in volts times amps. A 1HP compressor will use twice as many amps at 120 volts vs 240 and thereby use the same power.

-Andy

lyon 09-18-2011 07:50 PM
Just did a 500 mile road trip this weekend, got around 22 mpg.

manbridge 74 09-19-2011 09:56 AM
Quote:
Originally Posted by ivangene (Post 6259317)
very timely thread... I have been trying like hell to get better milage, I normally average about 16-17 but this last tank was really bad,.....I almost got 22!!!

WTH - I must be p@ssy footin around....there aint NO WAY I will stand for that - I hope to be SUB TEEN this next tank....


I didnt buy it for MPG!
This post is great.

I like to log mine just to analyze anomalies. If mpg drops off a lot under similar conditions, one might have a leaky injector etc.

rhauger 04-25-2012 06:32 PM
I recently purchased my first Porsche. It is a 1977 911 (2.7). The car is beautiful and everything has been reconditioned in one way or another outside of the engine. It currently has a few clicks under 130k miles and is leaking minimal oil. I am absolutely shocked about the gas mileage considering the weight and size of the engine!!? We are getting 12 MPG if lucky!? Is this common on Porsches? If not, any suggestions on how to improve or mediate??

tazzieman 04-25-2012 06:54 PM
Quote:
Originally Posted by rhauger (Post 6711833)
I am absolutely shocked about the gas mileage considering the weight and size of the engine!!? We are getting 12 MPG if lucky!? Is this common on Porsches? If not, any suggestions on how to improve or mediate??
That is not good! You could try duct taping a fresh egg under the throttle pedal ;)

tuchan 04-25-2012 07:27 PM
My 3.0 CIS is around 22-24 MPG

pete3799 04-25-2012 07:33 PM
1000+ mile round trip to Hershey,PA. got over 23 MPG

regency 04-25-2012 07:34 PM
My chit's averaging about 17 mpg in my 73 MFI Coupe and from what I've read, that's good for a MFI 911. Of course, I'm blasting around the foothills here in Rocklin, Newcastle, Cool, Meadow Vista & Auburn Calif.

Steve

73 911 T MFI Coupe, Aubergine

SilberUrS6 04-25-2012 07:39 PM
I hate to say it, but I don't know what the mileage is, and I don't care. I know I should track it for diagnostic purposes, but I the more gas I burn, the more fun I'm having. :)

4sd911 04-25-2012 11:18 PM
Quote:
Originally Posted by rhauger (Post 6711833)
I recently purchased my first Porsche. It is a 1977 911 (2.7). The car is beautiful and everything has been reconditioned in one way or another outside of the engine. It currently has a few clicks under 130k miles and is leaking minimal oil. I am absolutely shocked about the gas mileage considering the weight and size of the engine!!? We are getting 12 MPG if lucky!? Is this common on Porsches? If not, any suggestions on how to improve or mediate??
Does your car still have the CIS installed? Mine will go down to 15mpg in winter and up to 19mpg in summer. If you still have CIS it should be checked.

Hydrocket 04-26-2012 12:31 AM
From Fairfax VA to Detroit, MI, I got 26.5 MPG in my 1986.....

Autoban 04-26-2012 04:28 AM
I picked up my 3.2L '86 Cab in January in Ann Arbor Michigan and drove it to Winchester, Virginia. On the 441 Mile trip I got 25.2 MpG. Since then I did a good tune up on the car and now I get a little over 26 MpG on the highway. City driving will get me between 18 and 19 MpG. Sure beats my '10 VW Touareg which gives me maybe 14 MpG in the City and 20 MpG highway and the Carrera is much more fun to drive.

wjfk32 04-26-2012 04:53 AM
What I know I used to get maybe 20+ miles a gallon with my 911SC-3.3Turbo--7006-MSD6AL-AIC-HKS-SC/CAMS-BB Dual exhasut-KEP Stage 2-lLightweight PP--Stock intercooler..etc..etc..

Once I put my Andial/intercooler in I lost 15-20% in gas mileage..:(
Yes-The performance is there..But there is a price to pay no matter what.


Walt

Jerome74911S 04-26-2012 05:42 AM
My car has a '75 S engine in it with the original CIS. With steady-state driving on an interstate I get 30.1 mpg. Scooting around on little twisty roads and the mileage drops considerably. 12 mpg is a lot though.

kidrock 04-26-2012 08:12 AM
with my SW chip and M&K sport exhaust, I generally get between 22-23 mpg averaging 70-80 mph in 4th gear, with the occasional extended leg stretch (I won't say how fast).

On longer trips averaging 70-80 in 5th gear, I usually get between 25-26 mpg.

stlrj 04-26-2012 01:23 PM
Quote:
Originally Posted by zorin (Post 6256362)
What is the RPM range for the best fuel saving? 2k-3k ?
1.2k - 1.5k without a load. If your 911 cannot do that comfortably, it needs help.

island911 04-26-2012 05:39 PM
fwiw I have a Porsche Factory 911SC sales poster that shows:

35.3MPG @ constant 56mph
29.1MPG @ constant 75mph
21.1MPG Urban cycle

This for the Euro 9.8:1 compression 3.o engine.

JJG911 04-26-2012 06:53 PM
Another factor that I don't think has been mentioned is the amount of ethanol in the gasoline. Without question, ethanol lowers fuel mileage. Has anyone done a comparison between 100% gasoline and gasoline with 10% ethanol? I know that many areas of the country may not have ethanol free gas. so cannot make a comparison. One station near my house has stopped carrying mid grade gasoline and now gives one a choice of regular or hi test with 10% ethanol OR ethanol free (for 15 cents/gallon more than regular).

algs911 04-26-2012 08:06 PM
'86 911 here. From Santa Cruz to Reno I got 27 mpg. I seem to get around 23 or 25 regularly. On the track I got 11 mpg (friend in a JCW Mini got 7!!! Same day, same sessions).

For older cars, they're really not that bad! My 2006 VW GTI got about 25 pretty regularly, although I COULD get 30 if I went 50 mph. My new TDI gets 44, EASY. I've seen 48.x on my 40 mile commute!

Al


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