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-   -   Gas Mileage (http://forums.pelicanparts.com/porsche-911-technical-forum/349592-gas-mileage.html)

Spin City 05-31-2007 02:58 PM

Gas Mileage
 
I didn't get a 911 to be economical, but I was very surprised when I drove from Bothell, WA to my father's house near Boise, ID (541 miles) on a single tank of gas this past weekend.

It got 28 MPG going and 29 MPG on the return trip while going between 65 and 85 miles per hour (depending on the state). It did better than my Nissan and did it in style.

Gotta love the 911.....:D

on-ramp 05-31-2007 03:00 PM

I've always wondered about mileage . I have a 1986 Carrera Cab (stock) but it doesn't say anything about fuel consumption in the manual. What were these car rated from the factory ?

livi 05-31-2007 03:06 PM

I agree. For a performance car of that vintage, they are not very thirsty.

In my German manual the mileage is printed for three different speeds and city. It is in liter/10 km though.

Spin City 05-31-2007 03:08 PM

I still have the window sticker. It claims 18/25 mileage.

My 911 is essentially stock except for a Fabspeed cat bypass, Fabspeed muffler, and Steve Wong Chip. I use synthetic 20-50 motor oil and synthetic 75-90 transaxle oil.

It also has a "whale tail" which I'm sure kept me from breaking the 30 MPG barrier.

ramonesfreak 05-31-2007 03:12 PM

i get the terrible mileage. i can see the needle drop faster than my jeep cherokee, and, $75 to fill the tank. ouch

BlueSideUp 05-31-2007 03:12 PM

I think my carb'd 1970 911T gets somewhere in the neighborhood of 20mpg! It needs a little tuning as the Weber carbs seem to run quite rich.

masraum 05-31-2007 03:22 PM

The 3.2L cars are great on gas if you drive them that way on the freeway. They aren't bad around town either, but it's all relative to how you drive.

unimog406 05-31-2007 03:31 PM

my 2.0 w/ webers got approx. 4 mpg.

it is being thuroughly rebuilt as we speak....

Dave Nordhoff 05-31-2007 03:35 PM

My SC gets 25 to 27 hwy and 8 to 10 at the track.
Dave

S2GART 05-31-2007 04:27 PM

2 times I have driven my SC tp NJ, with an average trip speed of 74 miles per hour, I got 24 mpg. That works out to 504 miles. Who says you can't have your cake and eat it too?

cubby911T 05-31-2007 04:39 PM

my 89 Carrera gets an all-around average of 22 mpg (about 50/50 highway vs. city driving). That's with the SW chip by the way.

Noah930 05-31-2007 04:53 PM

Trundling along at around 70 mph, my stock 930 averaged 24 mpg from Portland to L.A. For a 21-gallon tank, that worked out to about 500 miles/tankful. Of course, that meant I also got passed by Prius', who were probably still getting better gas mileage.

84Euro 05-31-2007 06:04 PM

I have a 84 Carrera with a early 3.6. It has a SW chip, Elgin Super Street cams and springs, B&B headers and muffler, Authority mass air throttle body. and factory EFI. With out running the A/C and semi spirited highway driving I get 23MPG. I have occasionally got up to 26 MPG. But thats being well behaved.

gtihop 05-31-2007 06:05 PM

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.

sig_a 05-31-2007 06:05 PM

I-71 to a NORPCA DE at Mid Ohio race track in early May. Averaged 31/32 miles per gallon following tractor trailers in the slow lane the entire 160 miles. Average speed of about 60 mph at 2600 to 2800 rpm in 5th gear. Tires 5 pounds over 29/36 psi recommendation.

Rot 911 05-31-2007 06:13 PM

My 3.2 with rebuilt engine, SSI's and chipped gets 22 in town and 29-30 on the highway at 70 mph. I usually can go around 580 miles on the highway before I fill up.

WolfeMacleod 05-31-2007 06:46 PM

Re: Gas Mileage
 
Quote:

Originally posted by Spin City
I didn't get a 911 to be economical, but I was very surprised when I drove from Bothell, WA to my father's house near Boise, ID (541 miles) on a single tank of gas this past weekend.

It got 28 MPG going and 29 MPG on the return trip while going between 65 and 85 miles per hour (depending on the state). It did better than my Nissan and did it in style.

Gotta love the 911.....:D

I drove from Seattle, halfway to Portland, back to Seattle, then ALL the way to Portland, and halfway back to Seattle on one tank of gas last weekend - on 17.5 gallons of gas, actually. Not even a full tank. (21 gallon in an '85, right?)

The trip meter said exactly 500 miles when I filled up, and she only took 17.5 gallons.
I figure that to be 28.5 miles.


By the way, on the way back to Seattle the first time, and back to Portland the second time, I was hauling ASS trying to get to a bank in Portland before they closed...(My wife forgot her I.D in Seattle)

Jim Sims 05-31-2007 07:00 PM

Keep in mind the speedometer/odometer errors; easily can be 10% - usually in the direction that over estimates fuel mileage. Compound that with the differences in filling station pump shut-off levels - very inconsistent with the 911 gasoline tank fill system.

rnln 05-31-2007 07:18 PM

wow, you guys are imazing. I usually get 20 - 22 per gallon 90% freeway and I think my car is really good in gas mileage.

WolfeMacleod 05-31-2007 09:07 PM

Quote:

Originally posted by Jim Sims
Compound that with the differences in filling station pump shut-off levels - very inconsistent with the 911 gasoline tank fill system.
When I gassed up my car during our trip, I went a little overboard...at 17.5 gallons, gas was about to overflow.


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