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post #1 of 9 (permalink) Old 18th October 2005 Thread Starter
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How much is left in the tank??

On Sunday my trip computer said I had 65 miles of fuel left in the tank and then went from that to a low fuel warning with ----- displayed on the trip computer.

I can't see anything in the manual that gives me a steer,so does anybody how much fuel is left when the low fuel warning is displayed.

05 55 Laguna 120bhp diesel

As an aside, the manual says that the trip computer displays instantaneous fuel consumption, mine doesn't. Should it?

Thanks in advance,

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post #2 of 9 (permalink) Old 18th October 2005
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your computer calculates the average fuel consumption, basing on this it calculates the range; you can switch to consumed amount (in my Laguna II it is pressing button 2 times), this still works when you get an fuel alert, and calculate: size of the tank (assuming you filled it full) - cosumed fuel...
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post #3 of 9 (permalink) Old 18th October 2005
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As soon as the low fuel light comes on the "miles left" display will go to ----.
There will be approx 2 gallons left ( if our trip comp is right anyway).
The miles before fill up is calculated on current driving conditions is you are cruising at 60mph miles left will be higher, whereas if you are driving around town the display will give a much lower reading.

Ours doesn't show instantaneous fuel consumption either (2004 model). The ave display is the best one as it is the "average" and becomes more reliable the more miles you drive.

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post #4 of 9 (permalink) Old 19th October 2005
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You just spotted the two most stupid things about the Laguna trip computer. No instantaneous fuel economy, and the ridiculous refusal to tell you what your remaining range is when you most need to know.

Yes, you lose the estimated range feature the moment that the low fuel warning kicks in. Renault's excuse in the manual is that you should fill up ASAP on seeing the low fuel light anyway. It sounds like utter cobblers to me, considering that most other cars with trip computers will let you go right the way down to 0 miles range (at which point you usually still have a little bit left in the tank.)

But you learn to live with it. If I spot it just before it happens, I tend to do the following:
Flick onto the economy display and see what my current MPG is
Flick onto the range remaining display and see how many miles I have left
Do a quick bit of mental arithmetic to work out how much fuel that amounts to (e.g. 40mpg with 80 mile range means you have 2 gallons left.) Don't be afraid to round up and down a bit - it doesn't have to be spot on.
Flick onto the fuel used display, and either zero it or add on your fuel calculation. You can then count down to an empty tank in tenths of a gallon increments.

It's not nearly as tricky as it sounds once you actually try it.

Funnily enough, the Clio is similar but different. On all of my Lagunas, the blanking of the trip range display has coincided exactly with the low fuel light coming on and the voice synth saying "Warning, fuel level low." I'm not sure if this is the case on cars without the voice synth though. If they work like the Clio does, then you may be fortunate enough to get the warning light a short time before the trip computer gives up the ghost. That should give you a chance to make a note of the current range and do the calculations I mentioned above.
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post #5 of 9 (permalink) Old 19th October 2005
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This happens with the Scenic II as well - it's a pain, but you learn to live with it.
With the Scenic, when the range goes to ---- I know I've got about 50 miles left. When it comes to actually filling up though it always seems that I have about 9 litres left in the tank - sorry way too early in the morning so I can't do the math
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