Remaining range
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The Penguin King
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From: Houston
Remaining range
In the interest of all Rennlist members, I've tested the accuracy of the remaining range message (actually, I just didn't get to the gas station quick enough). At any rate, with my gauge saying I had 14 miles to go, when I accelerated, the engine died, then came back to life. Tried it again, and it did the same thing. I of course immediately drove into the next (and most expensive in the area) gas station, and filled up. The car's behavior tells me that the outlet for the gas tank is in the front of the tank, and that acceleration sloshes the ramaining gas to the back, thus starving the engine. I was a little surprised though when the engine sputtered like that, as all of my previous vehicles would run right down (and past) the zero miles left with no problem (not that I test it out all that often, but it has happened).
So... a warning to anyone who's not yet driven the car to that low of a fuel reading. Anyone else experienced this?
So... a warning to anyone who's not yet driven the car to that low of a fuel reading. Anyone else experienced this?
Instructor
Joined: Jun 2006
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Thanks for the post. In general running a car that low is simply not a good idea, but I've done it before. I hit 48 miles to go this weekend and wondered just how accurate the Porsche guage is. No more, I'll make sure to keep it above 75miles.
Pro
Joined: Aug 2006
Posts: 718
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From: Capitan< New Mexico
The low fuel light comes on at around 50 miles to go, with about 2 gallons left in the tank. I've found that range estimators in other cars are usually way off. Had a Mercedes once that said there was 500 miles to go every time I filled up and rarely made it to 400.
Porsche seems to be the most accurate yet.
Porsche seems to be the most accurate yet.
Poseur
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From: Santa Barbara, CA
Thanks for the real life numbers. With the 997s and the 996s in particular, Porsche strongly recommends that you not run them that close to empty. (Many years ago I ran my 914-4 down to empty, covering some 512 miles (Roseburg, Oregon to King City, Calif) with a consumption of 15.4 gallons of petrol. I apparently still had a gallon sloshing around in there somewhere!) 34 mpg! Best ever and never possible again!
Pro
Joined: Jul 2005
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From: Scottsdale, AZ
I think that the remaining range is pretty accurate with regards to what you have left in the tank. There is no 'bonus' gallon for safty. I am able to verify this by subtracting the filled up amount from tank capacity and then verifiing the amount based on MPG. So if it says 10 miles left, you likely have less than half a gallon.
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The Penguin King
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From: Houston
Originally Posted by Deven
I think that the remaining range is pretty accurate with regards to what you have left in the tank. There is no 'bonus' gallon for safty. I am able to verify this by subtracting the filled up amount from tank capacity and then verifiing the amount based on MPG. So if it says 10 miles left, you likely have less than half a gallon.
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Instructor
Joined: Mar 2006
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From: lancashire,uk
Originally Posted by mglobe
In the interest of all Rennlist members, I've tested the accuracy of the remaining range message (actually, I just didn't get to the gas station quick enough). At any rate, with my gauge saying I had 14 miles to go, when I accelerated, the engine died, then came back to life. Tried it again, and it did the same thing. I of course immediately drove into the next (and most expensive in the area) gas station, and filled up. The car's behavior tells me that the outlet for the gas tank is in the front of the tank, and that acceleration sloshes the ramaining gas to the back, thus starving the engine. I was a little surprised though when the engine sputtered like that, as all of my previous vehicles would run right down (and past) the zero miles left with no problem (not that I test it out all that often, but it has happened).
So... a warning to anyone who's not yet driven the car to that low of a fuel reading. Anyone else experienced this?
So... a warning to anyone who's not yet driven the car to that low of a fuel reading. Anyone else experienced this?
Thread Starter
The Penguin King
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From: Houston
Originally Posted by Edgy01
Mike,--is that the Midnight Blue? Interior?
Looks nice.
Looks nice.
Instructor
Joined: Jan 2006
Posts: 132
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From: San Diego
I think it's more of a wives tale that it wouldn't be good for the car to run it low. Of course, there's the risk of running out which is more of a fact than a wive's tale but in terms of bad for the engine it shouldn't be. I find it hard to fill up before 50 miles left when my tank only lasts 200 miles.
Pro
Joined: Nov 2005
Posts: 630
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From: Los Angeles
Ah my favorite way to egg the wife. The remaining miles indicator. It's based on engine speed so 50miles can turn into 10 miles in 2 secs. That said, I've never had my 997 down to more than 20miles at cruise speed. The older 964 trip computer wasn't very accurate.
The most accurate was my NSX and my old E39 M5. I did the calculations based on miles left and mpg readings and they were spot on.
The most accurate was my NSX and my old E39 M5. I did the calculations based on miles left and mpg readings and they were spot on.
Three Wheelin'
Joined: Feb 2006
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Originally Posted by stom_m3
I think it's more of a wives tale that it wouldn't be good for the car to run it low. Of course, there's the risk of running out which is more of a fact than a wive's tale but in terms of bad for the engine it shouldn't be. I find it hard to fill up before 50 miles left when my tank only lasts 200 miles.
Instructor
Joined: Jan 2006
Posts: 132
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From: San Diego
Originally Posted by gpjli2
Sediment from bottom of tank is the problem here. It is a real concern.
Today's fuels are much cleaner than in the past. The need to worry about such things is old tale. Not to mention you have a fuel filter that will filter all of the small particles anyway. And this is the same for the water in the tank tale as well. Water being heavier than gas will get sucked up first.