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      03-19-2016, 03:45 AM   #1
Maranello455
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Getting only 6 MPG

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I am getting only 6 MPG and thats driving ultra conservative,I have the original HPFP but no misfiring at all, can it be related to the poor gas mileage ? Also I got a symbol in my dash that looks like a hydraulic lift with car on top, what does it means? Service due or its a problem with an issue in the car ?
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      03-19-2016, 02:40 PM   #2
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Something is wrong.
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      03-19-2016, 02:54 PM   #3
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6mpg is like the minimum it can show I think. Could be an issue with the computer, but I'd recommend physically filling up, driving and seeing what the mpg actually is with math.

Could be HPFP, injectors, leaking gas tank, etc.
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      03-19-2016, 04:09 PM   #4
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Any codes?

If it was actually getting 6mpg it would not be running very well at all.
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      03-19-2016, 04:19 PM   #5
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☝🏻️ Something is Definetly wrong there...
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      03-19-2016, 04:36 PM   #6
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Definitely something wrong. And yes your car is due for service.
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      03-19-2016, 07:38 PM   #7
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Quote:
Originally Posted by Gohan335i7 View Post
☝��️ Something is Definetly wrong there...
What amazes me it is that the engine is running perfectly, no loss of power, no hesitation, motor temp runs very cool, no vibrations at all. does not consumes oil, no fuel leak whatsoever. It drives like a swiss clock. But it does indeed act like a gas guzzler. I do have a Cobb, downpipe, charge pipe etc. I was evaluating that maybe the culprit is the HPFP, but no symptoms that it is failing.................
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      03-19-2016, 11:00 PM   #8
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@ 6mpg, your tank would empty in under 100 miles from full.....
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      03-19-2016, 11:16 PM   #9
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@ 6mpg, your tank would empty in under 100 miles from full.....
I don't even think it is getting a 100 miles from a tankfull.
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      03-19-2016, 11:36 PM   #10
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have you noticed large pools of gasoline in your garage?
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      03-20-2016, 12:54 AM   #11
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have you noticed large pools of gasoline in your garage?
None. Not a single drop.
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      03-20-2016, 01:23 AM   #12
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My M5 on track day gets 10-11mpg, run it in a stationary position and look for fuel leaks. Open your oil fill cap and lightly smell the motor oil for a high gas smell. I find it hard to believe you car is running fine with that much fuel loss or usage, any codes?
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      03-20-2016, 01:25 AM   #13
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You would have to be running a 9.2:1 AFR all the time... It would signal nothing but emissions codes everywhere.
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      03-20-2016, 08:05 AM   #14
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Interested to see what you find out. 6MPG is definitely not correct if the car runs/drives fine. Maybe you have a bad speed sensor...
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      03-20-2016, 08:26 AM   #15
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I would be like everyone else, any codes? Even a Cayenne GTS older generation gets 11 (with a stick), bad, but not 6....

To contrast, I drove a Toyota Sienna rental 1700 miles for work, and that mofo got 29 mpg on the highway? wth? It's so cavernous.....and a shoebox on wheels
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      03-20-2016, 10:15 AM   #16
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Quote:
Originally Posted by muncie21 View Post
Interested to see what you find out. 6MPG is definitely not correct if the car runs/drives fine. Maybe you have a bad speed sensor...
I will fill up today and when empty will tabulate the MPG. How many gallons in the tank ? I thought the HPFP would be to blame. Also no codes, only the hydraulic lift symbol in the dash.
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      03-20-2016, 10:18 AM   #17
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Quote:
Originally Posted by Maranello455
Quote:
Originally Posted by muncie21 View Post
Interested to see what you find out. 6MPG is definitely not correct if the car runs/drives fine. Maybe you have a bad speed sensor...
I will fill up today and when empty will tabulate the MPG. How many gallons in the tank ? I thought the HPFP would be to blame.
You should fill up with roughly 15 gal, give or take 1 either direction. For comparison I average about roughly 300-360 per tank, of course depending on driving style and city or highway.
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      03-20-2016, 10:29 AM   #18
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What is the purpose of the speed sensor, do you mean the fuel pressure sensor ? Will a faulty one damage my MPG ? Also which is the proper idle rpm's ? Mine is at 600-700 tops.
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      03-21-2016, 10:38 PM   #19
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Speed sensor is how the car tabulates your distance (mileage).

The thing to do now is to manually check your gas mileage. Just in case, here's the procedure:

Fill up tank and and stop when the pump clicks off.
Reset your trip meter or write down your mileage.
Drive until the tank is mostly empty.
Fill up until the pump clicks off.
Miles driven divided by the gallons you just put in at the second fillip = miles per gallon.

Do this and tell us what you get.

I can tell you that you are not getting only 6mpg. The car wouldn't run. Or it would be running very poorly.

Also check for leaks. After the car runs for awhile sniff under the hood.
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      03-21-2016, 11:10 PM   #20
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Quote:
Originally Posted by patents View Post
Speed sensor is how the car tabulates your distance (mileage).

The thing to do now is to manually check your gas mileage. Just in case, here's the procedure:

Fill up tank and and stop when the pump clicks off.
Reset your trip meter or write down your mileage.
Drive until the tank is mostly empty.
Fill up until the pump clicks off.
Miles driven divided by the gallons you just put in at the second fillip = miles per gallon.

Do this and tell us what you get.

I can tell you that you are not getting only 6mpg. The car wouldn't run. Or it would be running very poorly.

Also check for leaks. After the car runs for awhile sniff under the hood.
Could not do it as I had to jump start my battery, maybe I left a cabin light on and it drained my battery, it was replaced by dealer in 2013. Could it need replacement again ?
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      03-22-2016, 03:08 AM   #21
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bro, someone is siphoning your gas at night... j/k that doesn't change the mpg.
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      03-22-2016, 03:41 AM   #22
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Quote:
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bro, someone is siphoning your gas at night... j/k that doesn't change the mpg.
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