You need to add some mods to increase you mpg. Window tint is worth 1mpg, Bumper Plugs gets you 2 mpg. The best is an MP 3 player it's worth 3 mpg. And if you can find any space tape from the 70's it's worth 5 mpg.

 

19.5 mpg DD
26.5 highway @ 78 mph

 

19 -23 for me...

 

Last three tanks, close to 600 miles, about 50/50 highway/city, and also 1 day of autocrossing (12 runs of 67 second track), I have 16.3 mpg on the computer.

I did a run of max mpg for a tank, doing my normal driving (no autocross, no long freeway trips), managed to hit 22 mpg across 200 miles.

Normally I run at around 18-19 mpg, and I hit it pretty hard whenever it's safe. I'm very impressed with the fuel efficiency of this car.

Completely stock 2003 996 C2.

 

About what I get on my 03 Z06 vette. City is 17-19. Highway (@80mph) is ~25mpg

 

About 22.4 over the last 6k miles with 50/50 city/hwy.

 

So I only get 13.9 mpg avg with my daily stop-go town driving, and everyone else is getting such higher numbers?
My engine checks out 100% ok and I've got 29k miles on it.

sycarrera that sounds about right to me, based on what I'm seeing. I'm about 95/5 as well.

I do have a heavy foot light to light- In comparison my 330i was averaging 11+ mpg... pcar is slightly better

 

Mine averages 19.3 mpg

 

The dyno curves after plenum install show about a 10% boost in torque all around the 3K RPM range. Would this be enough to enable a 20% increase in MPG?

 

200-240 a tank is what I have been getting lately

 

Just did 200 freeway miles today at avg speed of 85mph - was getting 23mpg..