Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

Is this (gas mileage) possible???

Thread Tools
 
Search this Thread
 
Old 09-05-2006, 05:46 PM
  #16  
anonymousagain
Rennlist Member
 
anonymousagain's Avatar
 
Join Date: Nov 2005
Location: NorCal - Bay Area
Posts: 861
Likes: 0
Received 1 Like on 1 Post
Default

Regular use the '80 AT gets ~17 and the '86.5 AT gets ~18, mixed semi-normal and get-on-it driving. Normal driving only results are 18 and 20.5, respectively. Worst of, ummm, WOT testing was 15 and 16.

My better half drives the '86.5 @ 19 all the time, normal driving with occasional intermittent 60-80 2nd gear blasts for grins. I wouldn't be surprised to achieve 22+ on a long trip, if concious of trying to get good mileage.

Ron - funny about the rabbit. I get similar responses all the time when I tell them the 928 is 18-20mpg --> they say, "Wow, you could pretty much drive that all the time. Besides, I feel like I'm always on the gas in my commuter car anyway, just trying to keep up!" Actually, one of the reason's my wife is happy with the Shark, since she was expecting more like 10-12mpg.
Old 09-05-2006, 05:52 PM
  #17  
Sias
Advanced
 
Sias's Avatar
 
Join Date: Feb 2003
Location: Chattanooga TN
Posts: 53
Likes: 0
Received 0 Likes on 0 Posts
Default

I averaged 21 mpg this weekend on a trip from Philadelphia to Chattanooga with lots of slow traffic on I 95 and relatively slow speeds through VA. Two weeks a go when I drove my car up to Philadelphia, I got 21.5 mpg, the distance is just over 700 miles each way.
Sias
89 S4 auto Black/black
Old 09-05-2006, 06:07 PM
  #18  
Richard S
Addict
Rennlist Member

 
Richard S's Avatar
 
Join Date: Jun 2001
Location: Elk Grove, Ca
Posts: 3,695
Received 123 Likes on 76 Posts
Default

From Battle Mountain Nv to Reno Nv I covered 226 miles and used just over 9 gallons of gas, averaging right at 24mpg. Remember, the 87 has the 2.20 rear end, so the rpms are low while cruising at 70-75mph. Why was I going so slow?....I was travelling back from the Pony Express with Tim and Cheryl following me with their truck and trailer. During the race I averaged 129.974mph for 130miles, and got about 10-11 mpg.

Rich
Old 09-05-2006, 06:23 PM
  #19  
Okv
Instructor
 
Okv's Avatar
 
Join Date: Aug 2006
Location: Ålesund, Norway
Posts: 173
Likes: 0
Received 4 Likes on 1 Post
Default

I drove my NEW! '91 GT home from Switzerland to Aalesund, Norway, from down in Sweden up to Andalsnes i managed 1.06 l/mil, which equals 22 mpg.
I do not think it is physically possible to do much better, but I really must say I am amazed, and at higher speed it is actually more economic than many other cars.

Regular driving around here is around 18 - 19 mpg, and that I can live with, as the Shark is pure entertainment all the way to the doorstep.
Old 09-05-2006, 06:32 PM
  #20  
greg928GTS
Racer
 
greg928GTS's Avatar
 
Join Date: Oct 2005
Location: Baxter Tennessee
Posts: 389
Likes: 0
Received 2 Likes on 2 Posts
Default

I got 27 mpg on a 13 hour trip from Pittsburgh to Central Maine about 10 years ago. But that car was a 1988-1/2 928 5-speed that was very "special".

Let me explain, a 1990 front attached to a 1987 rear. So I think something was weird about the gearing. The rpm's seemed very low at 75 mph in 5th.
Old 09-05-2006, 07:02 PM
  #21  
jheis
Burning Brakes
 
jheis's Avatar
 
Join Date: Sep 2003
Location: Wine Country, CA
Posts: 1,168
Received 11 Likes on 7 Posts
Default

With the improvements in engine management, the later cars got better gas mileage.

The best I've EVER seen in my '82 was 20.46 and that was on the downhill run from Tahoe on the return leg of a trip to Colorado. Average for the trip was 18.6. Around town I usually only get 12 to 15.

James
Old 09-05-2006, 07:24 PM
  #22  
Kaz
Three Wheelin'
 
Kaz's Avatar
 
Join Date: Jun 2001
Location: Los Angeles/Honolulu
Posts: 1,298
Likes: 0
Received 0 Likes on 0 Posts
Default

On long haul trips I get anywhere from 20-24 depending on speed.
Old 09-05-2006, 07:32 PM
  #23  
jorj7
Addict
Rennlist Member

 
jorj7's Avatar
 
Join Date: Apr 2002
Location: SF Bay Area
Posts: 2,197
Received 54 Likes on 25 Posts
Default

I usually get 18-19 mpg going to and from ORR events. Get about 5 mpg during the ORR event.
Old 09-05-2006, 07:37 PM
  #24  
Ron_H
928 Barrister
Rennlist Member

 
Ron_H's Avatar
 
Join Date: Sep 2002
Location: Sunnyvale, CA
Posts: 4,772
Likes: 0
Received 5 Likes on 4 Posts
Default

OKV said: "......as the Shark is pure entertainment all the way to the doorstep."

That's the problem, if it is a problem. When I'm rationalizing driving the Rabbit, I find excuses not to like it, like it is uncomfortable, slow, shakes and rattles, etc. And it gets only the same mileage as the 928. And the 928 is SAFER; no amount of money can compensate you for your death or horrible disfigurement if you can't escape of avoid an accident. That alone puts a smile on my face in the 928, and when I get my roll bar, I'll feel even safer around outrageously out of scale SUVs following me so closely.

And the 928 is a hatchback and swallows loads almost as easily as the Rabbit.......hmmmm.....
Old 09-05-2006, 08:33 PM
  #25  
docmirror
Shameful Thread Killer
Rennlist Member
 
docmirror's Avatar
 
Join Date: Aug 2004
Location: Rep of Texas, N NM, Rockies, SoCal
Posts: 19,831
Received 100 Likes on 65 Posts
Default

Since I've pressed my 90GT into daily service, I've been checking the economy carefully. I get an average of 19.7 MPG on most tanks. Mixed city mostly hwy driving with AC on. Remeber this is a 5 speed with the 2.76 gears. I don't speed much, and drive conservatively. I'm looking for a 87-88 with the low gears to get better mileage.

Not bad for a car that will top 170MPH, even if at higher fuel consumption.

Doc
Old 09-05-2006, 08:51 PM
  #26  
Normy
Banned
 
Normy's Avatar
 
Join Date: Feb 2002
Location: Ft. Lauderdale FLORIDA
Posts: 5,248
Likes: 0
Received 4 Likes on 3 Posts
Default

I'm driving an Austrian-spec 928 in Florida. I turn 2200 rpm in 5th gear in my '85 928S2.

13.4 miles per gallon is normal, though after I rebuilt the intake recently, I have achieved 14.0.

-I once managed 23 mpg driving between Orlando and Lakeland, Florida. I took it easy [70 mph], and rode with a friend. Normal highway fuel efficiency for me is 21 miles per gallon.

Again, this is an S2. This is a "Euro" car that has been brought to the United States, and I have since changed it back to European specifications. Probably 270 hp at the rear wheels, no catalytic converters...yet. Random Tech cats are on order.

N!
Old 09-05-2006, 08:55 PM
  #27  
neilh
Rennlist Member
 
neilh's Avatar
 
Join Date: Mar 2004
Location: Southport, NC
Posts: 1,602
Received 7 Likes on 3 Posts
Default


I drive a Land Rover every day and 14 - 18 is the norm for it around town, so whatever the 928 gets is fine by me...... If i cared about mpg I probably wouldn't drive either of them!
Old 09-05-2006, 08:58 PM
  #28  
perrys4
The Lady's Man
Rennlist Member
 
perrys4's Avatar
 
Join Date: Sep 2003
Location: south O.C. california
Posts: 10,444
Likes: 0
Received 0 Likes on 0 Posts
Default

So whats wrong with my car. I am averaging 15 mpg around town and I drive it like a G-Pa. I know Dr. Bob told me he gets near twenty. I have changed out everything, PLugs, rotors, caps, o2, fuel filter and wires. Any idea's?
Old 09-05-2006, 09:39 PM
  #29  
dr bob
Chronic Tool Dropper
Lifetime Rennlist
Member
 
dr bob's Avatar
 
Join Date: Oct 2001
Location: Bend, Oregon
Posts: 20,506
Received 549 Likes on 412 Posts
Default

I'm averaging 18.2 in combo duty, and over 19 on most trips.

Last time I went to Devek Days, I set all the computers to track what they track. Mind you this is a straight blast up I-5 for most of the way, a freeway ride down the hill to the Gilroy, right turn up 101 to Devek with a small detour into South San Jose for a shower on the way to dinner. Cruise set at 75 most of the way, just barely keeping up with traffic.

Average speed, per the display-- 51 MPH (!). There was a detour at the top of 152 towards Gilroy, about 20 mins of BS before we took off again. We took fuel in the car once, lunch, and two 'personal' stops. So much for high-speed touring in California.

Average MPG over that tank was 20.1, including the 75mph pull up and down the Grapevine and the 7mpg 75MPH run up the hill from the house to the 210 right at the beginning.

We gassed at Morgan Hill, right off the freeway, with 1/4 tank showing and almost 400 miles on the meter. Gauge was optimistic about what was left in the tank. Per the 'miles remaining', we could have easily made Devek without that stop.

---

I depend on getting 350-400 between fills. I'm not a fan of running the car on fumes, so I start shopping at 1/4 indicated on the gauge. That little light comes on at 1/8, and the dash warning message comes up at the same time. So the car doesn't really want to run on fumes either.



Ron Perry--

-- Put a raw egg in your shoe. --Under-- your toes.

-- Let the car drive in the highest gear possible. There's a thermal efficiency law in some states that governs engine speed and mileage, better with lowest possible RPMs for the most part.

-- Avoid using the brakes. Brakes are the enemy of mileage. Every bit of motion converted to heat in the brakes is lost, and needs to be replaced by more heat to get motion again. Heat costs money to replace.

-- Avoid going around corners.

-- Always drive downwind.

-- Always drive downhill.

-- Buy good gas. I did a side-by-side compare between the stuff they sell at the local Costco, vs a name brand (Unocal) from my local station. I was driving exactly the same roads every day to a project, 300 miles a day, in the Explorer. The difference in price for the gas was exactly erased by the difference in mileage. It was like the stores were selling BTU's for the same price. More $$ per gallon gets you more BTU's. Amazing! So I support my local gas guy, keep him open, avoid the long gas lines at Costco. How much do folks save while they sit there, idling with the AC on, waiting to 'save' maybe a buck on a tank of gas? My car eats about half a gallon to a gallon per hour idling, so no savings there for me!

Your 2.20 car should get better mileage than mine in anything other than stop-and-go driving. Then it's really close.


---

I took two turns --out-- of the TV cable to the trans to get the car to shift up sooner. So I'm net one turn tight from what the car came with. Trying to get rid of the clunk on upshift, and to get the upshift to happen without having to trail off the throttle. It's a different car this way. I'm going to drive it for a while to see if I want to take the last turn out.
Old 09-05-2006, 09:55 PM
  #30  
Joe '87 S4
Addict
Rennlist Member

 
Joe '87 S4's Avatar
 
Join Date: Feb 2002
Location: San Francisco, CA
Posts: 831
Likes: 0
Received 1 Like on 1 Post
Default

On longer trips, I get just over 20 mph. That's with the ac on. Around town it's anywhere from 15-20 depending on the mood I'm in.


Quick Reply: Is this (gas mileage) possible???



All times are GMT -3. The time now is 04:57 PM.