johan.eklund

Hi All,

ANy tips on how to get better fuil comsumtion on 996 from 2003.

Great weather for taking the roof down today ins Sweden.

Kind reg Johan

GC996

Johan, my fuel mileage was averaging 13 mpg around town and 16 mpg on highway. Did a major refresh of parts 2 years ago including fuel injectors, spark plugs, ignition coils and MAF and I am now averaging 16 around town and 19-20 on the highway. Probably can get more but i enjoy using the powerband.

acf321

Drive it less? Just saying ....

Mike Murphy

I get about 17MPG combined city and highway, but if I drive only on the highway at 65, I’ll easily get 25mpg. If I drive 85-90, it drops down to 19 or 20.

Make sure your tires have the correct pressure, and coast to long distance red light stops, and you should be good.

If your car is getting 13mpg, and it’s not sprited driving, something’s wrong.

I think I averaged 7-8mpg on the track because WOT is a good way to drain your tank and having fun at the same time.

GC996

Don't know how a GT3 throttle body with an IPD competition plenum influences mpg on a M96. But the bigger throttle body probably doesn't help improve gas mileage.

wildbilly32

I know gasoline is expensive these days but I ignore the fuel usage in both of my "toy" cars. It's smiles per mile that I keep track of...Like GC996 said the powerband is where the fun is and that comes with a cost.

peterp

What mileage are you seeing in your 996 @johan.eklund ? Do you have any modifications on your car? Gas prices are worse in Europe than we are used to in the US (I'm guessing about $7 a gallon in Sweden?).

The 996 is definitely thirstier than it seems like it should be for such a small aerodynamic lightweight car. I don't run the engine steady state under 3k RPM (I feel it's better for the engine) -- which means that I'm sometimes in 5th gear instead of 6th on the highway depending on speed. I'm sure I could get better mileage if I shifted up a gear, but I refuse lug the engine on the 996. I've never measured MPG because the 996 is for fun driving and I really don't keep track. The main downside of the not very good MPG for me is that I fill up more often than I'd like.

The EPA estimates for 2000 996 are 15 city/23 highway for a Carrera 2 and 15 / 22 for a Carrera 4. Interestingly, the EPA mileage is the same for 6-speed and Tip, but differs slightly on awd vs rwd.

https://www.fueleconomy.gov/feg/Find...15636&id=15638

golock911

I've got a 3.8L with the IPD plenum and 82mm throttle body. I just drove across the country. Typical cruising speeds between 80 and 85mph. Overall trip was 25mpg. My normal use is mixed city/hwy and I get 15-20 depending on what I'm listening to.

Johan, Something is telling the computer to add fuel. Can you get a scanner and look at the fuel trims. If you don't have any codes or CEL, maybe the O2 sensors are somehow indicating it's lean, thereby asking for more fuel. Injectors could be clogged or not spraying correctly. This will also end up as bad signals to the computer. Get some readings first. Although I do like the idea of changing plugs coils and filters. Especially if you don't know when it was done last. Good luck!!

GC996

Appreciate it Paul. Yeah, all codes are good. New everything on the car. I am just heavy footed and can't resist taking it thru its paces. Never listen to the radio, but I do enjoy the sucking sound of the intake and exhaust.

peterp

Fixed it for you

golock911

Sorry Glen. My comments were information for Johan. I pulled your quote to reference the GT3. If there's one car here that I know is running well, it's yours. I think you hold the gold standard for how these cars can last when taken care of properly.

Porschetech3

A good friend of mine and a Rennlister here told me his 4.0 FSI got 34 MPG on a cross country trip recently...That's pretty impressive...

I have specialized in engine management even before fuel injection and emission controls were mainstream, and I can tell you that with modern cars 95% of the time when fuel mileage is a real concern ( and no fault codes) the 02 Sensors are responsible for the wasted fuel...Their main job is to monitor and help control fuel mixtures. They used to be mandated to last 80k miles, with the reduction of ZDDP they were hoping for 120K miles , but they often get lazy way before this...

SealG996

My 996 LN3.8 is way better than my LS9 Holden (Chevy SS).

SSDVC

My bone stock 2001 C4 Cab gets about 22 mpg on the highway (around 24 mpg if I keep her under 70 mph) and about 18 mpg around town.

Carlo D

hell I might as well change mine. Not sure if previous owner ever did.