ceedee

i think my gas mileage is great when the RPM thingy spins faster than the gas needle.
but that's just me

soontobered84

Ed,
And to think that I thought you had found all those things; The pot of gold, the fountain of youth, and what ever the last thing was. I forgot what it was and they say that memory is the second thing to go!!

Jerome Craig

Ed, you wouldn' be a part of this forum if you hadn't already figured out the shark's gas mileage "shortcoming" and embraced it

PorKen

I just installed a euro gauge in my '86. Cruising, it's usually around 10 on the dial. I have not been able to get my odo to work consistently, so I don't know the actual.

L/100KM -> MPG

_5 -> 47
--- -> 33.4
10 -> 23.5
--- -> 18.8
15 -> 15.7
--- -> 13.4
20 -> 11.7
--- -> 10.4
25 -> 9.4
[ ] -> 7.8

SharkSkin

Well, I don't track it closely, but when I see around 210 miles on the trip odo & I put 19.2 gallons in, that's my typical work-only commute pattern. Work is about 3 miles each way, except twice a week I take the long way in to work, ~10 miles of freeway taken at a pace intended to keep the cobwebs out. So the car is running on the cold enrichment circuit for a disproportionate amount of time. Also, mine is a purely mechanical injection system, your '80 is EFI with a feedback loop. I'd expect it to get better mileage under the same conditions.

Things are easing up with me time-wise so it will get more weekend driving -- sharky and I both are happier when that happens. On a fun run, doing moderate speeds, I'll usually get more like 275 miles out of a tank. I don't drive with gas mileage in mind, but I do track it on long trips just out of curiosity.

SharkSkin

Interesting -- they run as good as or better than copper? Are they the 4-electrode french tickler type?

IcemanG17

My mileage is varies quite a bit......for example.....driving 120miles to a DE...20.5mpg....fill up drive 4 miles to track...drive 80ish miles on the track and back to same gas station before home....8.8mpg....on the way home...again 20ish...... On the way to LA averaging 80-90mph it got 18mpg, but on the way home at a slightly more spirited pace it got right at 20mpg....

If you look in the back of the owners manual where the power-torque charts are there also is a fuel consumption chart.....with the 2.2 rear end the lowest comsumption is right about 3K rpms......OR about 90ish mph!!! "officer I was just trying to save gas!" Bottom line is 928's are not gas misers

928Myles

Stock '90 S4 Auto - Since ownership (over 3000 mi) 21.95 MPG. A run of 460 km (280 mi) in 3.5 hrs gave 20 mpg with speeds up to 250 kph (150 mph) reached. The return trip (with wife in the car) at 70 mph gave 25 mpg.

Garth S

While not offering the exotic erotica of a french tickler, the original spec pure silver electrode Bosch plugs have given me consistent excellent performance.
WR8DS for the 16v, and W7RDS for the 32v cars ......

RngTrtl

This will sound silly, but when I took my 85 on her 1st trip out of town (Starkville ms to Jackson ms) I drove at 60-65 for 2.5 hours averaged just a tad over 27mpg, the tach never got over 2400 rpm. it was measured by the tank.

Ed Hughes

That would be the ones. In fact, it was after putting the new plugs in that some random average mpgs on the dash were about 1 mpg higher.

H2

I've decided the only way to get 21-22mpg out of my shark is to use cruise control....when I don't I'm always playing around with the gear shifter thingy and mileage goes to pot. It may be a design flaw.

Also, a well known NW 928 mechanic/racing fanatic says the Bosch 4 Platinums don't work well in 928s. Don't in my '85S anyway.

H2

SharkSkin

Ed, were you replacing a high-mileage set of plugs? Not trying to argue with you about your results, but everything I've heard about these multi-electrode platinums is that at best, they are no improvement over copper and I'm curious about your different results.

Ed Hughes

I don't know the mileage of the old plugs, and this wasn't a scientific study, but IMO, my mileage went up.

I'm not sure where you've heard the non-positive issues on the +4's.....They may not be the best thing since sliced bread, but I've had good luck with them, and know many 911 guys that swear by them. I never thought twice about going to them when I put new plugs on my list of to-dos, to me, this is the plug to have.

IMO, the 4 electrode design and it's "unshielded" spark make perfect sense when I consider how the "perfect" sparkplug should look. Gapped perfectly all of the time, too.

SharkSkin

Thinking back, I seem to recall that the issues were with NOX on smog checks, with copper performing better. Maybe not an issue in Tx?