Smudo

I get 23 to 26 on a highway and 15 to 18 in a city and around 7 on a track. I usually do not warm up the engine but start driving with low rpms and low boost. That is also suggested in the drivers manual. This allows to warm up the engine quicker.

Ronin-951

Filled up Friday, 25.4 mpg, 50% of the miles +70, but all under 140, ... Winter an all.

spanky

Im getting 21/22 MPG, combination of highway, mountain roads and congested city streets. I am also running thick oil , twin V M1 20/50

Dave W.

11mpg is too low, something is wrong unless you're simply idling for hours.
How old is your O2 sensor? When they go bad the car tends to run rich.
Recomended tire pressure is 36psi. Every 5 psi difference = 1 mpg. I commute with 42psi in my tires.
Like Smudo said, the best way to warm up the car is to warm it up by driving slowly and avoid boost. I like to start driving within 30 seconds of startup, but I just drive slowly for the first few miles.
I also recommend avoiding high revs. Shift up when cruising, shift early to keep the revs down. In typical city driving I like to upshift around 3k rpm.

seattle951

The O2 sensor was replaced two years ago. The car has 1,500 miles in the last 2 years. The wideband O2 tracks mixture. It cruises between 14.5 and 14.7. Tire pressure is 34 lbs cold, 40 lbs warm. The traffic jams are pretty bad. I can be stuck for 30 minutes to cover a 1/4 mile sometimes.

Smudo

This might be the reason for such a low mileage. I sometimes get only 12 MPG in my VW TDI when I am stuck in the traffic jam to the work. It's just 2 miles and sometimes I spend 30 minutes to cover that and get such a low mileage. The city MPG is to subjective to compare. For that purpose highway consumption is better.

Dash01

Drive to Spokane and back, let us know the actual highway mileage. Should be upper 20s at normal cruise speed on that route.

Crackership

I used to drive my 951 nearly daily through the horrible mess that is I405 through the Renton S-Curves, and then through the absurdity that is the I405/I90 interchange, and then through Redmond at peak traffic hours... So I've got some experience in the traffic jams you're talking about. I still got closer to 15-18mpg doing that. Also, I really doubt any of the mods I've done do anything to help my car's fuel economy

Now that the 951 only occasionally makes the trip to work and does a lot more open highway 70mph+ cruising and a lot less sitting in traffic, I get more like 22mpg usually.

11mpg seems pretty low, even for being stuck in traffic.

seattle951

I am driving from Mercer Island to Redmond every day. The 30-minutes I am talking about is the time to get from 90 to 405. Sometimes, the traffic is backed up all the way onto the island across the 90 bridge.

I got a call on Friday, my Mercedes from Bogota has cleared customs in Miami and is being shipped to Seattle. Once it arrives, the 944 will be for the track again. I am getting too old to fold myself into the car.

Using the car for a month as a daily driver, has helped me clean up lots of small problems that I never worried about before. Before it becomes a DE day car again, I plan to finish fixing the little things.

I am glad someone else can appreciate the Seattle traffic.

Dave W.

If it takes 30 minutes to cover 2 miles, I'd start walking to work, unless it rains a lot in that area.....

Crackership

Rain? Seattle? No...

Motorcycle + Gore-Tex = Only reasonable way to commute around here.

George D

Me and my road or mountain bike can do this in under 10 minutes, snow requires the fattie tires on the mountain Trek hardtail.

Dash01

The Motronic DME computer for our engines has an adjustment for fuel enrichment. (I learned this when opening the box to install a new ignition trigger and reflow the solder joints, a common failure point.)

Anybody tried leaning out the fuel mixture a bit, to see what mileage change there is?

seattle951

Would you use this switch with a Turbo car? As I understand it, the switch is used to lean out the mixture for high altitudes. Less air = less gas needed. With a turbo car, the altitude is less important.

User 52121

I lived in the Seattle area for a few years. First few months I commuted from Westlake to Redmond and I remember the commute over the 520 bridge... AWFUL. More "stop" than "go". I eventually moved to Redmond (then later Sammamish) and learned pretty quick that you never want to commute from eastside to west (or vice-versa). My team moved from Redmond to Bravern... I left the company right before the team moved again (to South Lake Union). That commute (from Sammamish) would have suuuuuuuucked.