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Join Date: Jun 2010
Location: beaux arts, wa
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why is 930 mileage so much better on long trips?

Daily commuting 11 miles each way on freeway I am averaging 12mpg per tank. No turbo until engine is up to temp and then only one event per commute. Probably 5 minutes at 25 mph, followed by 7-8 minutes at 60-70mph.

Last weekend I visited a friend, involved 70 miles each way at 75-80mph. Refilled after the trip and was surprised to see 18 mpg.

Same gas, same cruising speed. Any ideas why there is such a huge difference?

Does car use more gas when warming up? Suggestions I might try to improve my daily mileage?
Old 06-21-2011, 10:21 AM
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Location: Central Valley, CA
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You have wayy to much time on your hands... but I will say what I think it could be.

1) Different driving style on long trips (even though you say it is the same)
2) oil is thicker when cold which make the motor work a little harder
3) car may be running richer when cold which could use more fuel
4) sustained highway driving rather than stop and go at the end and beginning of your short commute.

Just a few things that could affect it. Sounds average to me.

Cheers,
Bryan
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Previous cars:
1987 930, 1975 914 2.0, 1989 944 Turbo S, 1991 964 Targa, 2004 996TT Convertible, 550-6 Spyder with a 2.4 liter twin plug "S-spec'd motor"

Current cars: 2006 Cayenne TTS, 1991 964 Cabrio, 1997 993TT, 1984 Jeep Grand Wagoneer
Old 06-21-2011, 12:12 PM
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^^^^

In a nutshell... for all the same reason that the same holds true for any other car.
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Rob Montgomery
'88 Blk/Blk 930 ('Lucy') - Not Stock & Not Running
Old 06-21-2011, 12:48 PM
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The only cure is to stop the daily commuting. Just work from home on your computer. Or, move your place of work out to say 50 miles of freeway driving and enjoy the better mpg.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 06-21-2011, 06:57 PM
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I'd always heard the mileage was better with extended freeway driving, but this is a 30% delta compared to normal. What is all that gas doing during my normal commute? Heat cycle the oil? Over-rich warm up?

Seattle's weather has been crazy good the last few days. Time to break out that motorbike, it gets a whopping 40mpg + carpool privleges.
Old 06-21-2011, 08:18 PM
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12 mpg in town??? that's pretty good... I have the same problem but way worst in town... I assumed that it was due to higher rev compared to speed and the assh**&? that I have to pass a few times going to work. Gas is still "cheap" compared to milk... Although I know that I use a whole lot of gas... it still puts a grinn on my face everytime that I hear that turbo whine from the windows...
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David
1985 Black 930, K27 7006, Garretson Intercooler, Adj boost, TB: 23 - 31mm, bielstein sport shocks, ER polybronze bushings front and rear, ER monoball joints front and rear with offset camber plates, 935 X triangulated strut brace, raised spindles, racing bump steer kit
1981 Black 911sc (sold)
Old 06-21-2011, 08:45 PM
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