I have a 2002 911 Turbo. According to the owner's manual the gas tank can hold roughly 16.5 US gallons, but the gas gauge slows close to empty with only about 200 miles on a tank. When I fill up the tank it only takes about 10.5 to 11 gallons. Is the gas gauge off that much? If I average around 19 miles/gallon I should get at least 285 miles easily on a tank of gas. Anyone else have this problem?

 

My gauge and computer are pretty accurate.

I average 15-17 mpg in town. That's what the computer says, and that's what the straight math says.

 

i get about 14mpg

200 per tank if i do highways and it's a lucky day

 

At the track I get maybe 8mi/gal and the computer says 19.

 

FWIW

I had a fuel pump failure last year. After replacing the fuel pump, the technician needed to recalibrate the fuel sender and fuel gauge so that it reads correctly. The procedure is to start with an empty tank, add a specified amount, calibrate, add another specified amount and calibrate again. There maybe 3 steps to the calibration process. My mechanic was unable to get the service tool to calibrate correctly. Now when my computer reads --- miles to empty, I still have about 2.5 gallons left. I'm going to schedule my next service on a day that the Porsche service rep is available to assist.

Cheers,

 

My fuel gauge doesn't always read full after fillup. Wish they provide a dipstick for the gas tank. It'll be useful for those "---miles" to go situations.

 

i get 140-150 miles per tank ... that does not sound normal

 

Remember it is a running average. Make sure to reset the computer to a new average.

 

Same problem here and it has never fixed, they tried all the reprograming stuff, I gave up on it.

 

Too wild. The same thing happened to me just yesterday. I got the low fuel warning light and corresponding warning messages, the gauge read fumes. When I went to fill it up, it only took 10 gallons. WTF?

 

Computer says I get 16.2 MPG overall. I get just around 220 miles before my reserve light comes on. This sounds relatively accurate if we have 16.5 gal tanks.

FYI on the track using 91 octane I get around 5-6mpg.

Those of you who get mileage lower than 16 mpg should consider how hard you're driving before complaing that your car is wasting gas.

 

i dont drive it that hard ... its not my fault i was born with a lead foot

 

Damn i get like 10 mpg at best.

 

The fuel low light/message comes on with ~3 gal remaining, or when you have ~30 miles on remaining fuel (you'd get this only when getting >10 mpg).

If you fill up right after getting the fuel low light, you should put in about 13 gal to fill up, depending on the altitude and temperature.

 

The guage in my 2002 996 TT does the same thing. Slightly annoying. I'll get it checked out next time I'm at the dealer, but I'm not holding my breath that it will be fixed.

- Rich