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Old 02-18-2017, 03:23 AM   #1 (permalink)
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Default Fuel consumption question

Our 2009 GV, 2.4 litre engine appears to be using a hell of a lot of fuel. Or the trip computer/ fuel gauge is talking rubbish. According to the specs it has a 66 litre tank. The average fuel consumption on the trip computer shows 8 litres per 100 kilometres. So on a 66 litre tank the range should be around 800 kilometres.
The range on the trip computer when the tank is full shows 455 kilometres. I have driven 250 ks and the fuel gauge is showing the tank is half full. ( I am going to fill it up and see how much fuel it has actually used) however something does not add up. If it really is going to do just 455ks on a full tank, that means it using 15 litres per 100ks! Any ideas?
When I can get to a petrol station I will fill it up and see how much fuel it has used vs distance travelled and report further.

Last edited by Norlup; 02-18-2017 at 03:38 AM.
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Old 02-18-2017, 04:16 AM   #2 (permalink)
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Hi Norlup.Yep, the fuel gauge is rubbish ! You have to trickle in the last 5 litres of fuel. And if you can get the gauge to read full, it will drop very quickly to the 3/4 mark.(after travelling a few kilometers.)
I think the distance to empty will go up gradually, the longer you drive. The litres of fuel per 100kms will take an instant calculation of current accelerator input. (this is after you have reset it by pushing in RH knob)
On a recent long trip (1800kms) I also was returning 8L per 100kms. Kms to empty after filling up was 720kms.
This is a 2012 2.4L 5 door Auto. Standard tyres, no roof rack.
I now pretty well ignore the fuel gauge figures etc. I never let the fuel tank get near empty, always keep it at least 1/4 full.

Last edited by Drovers dog; 02-18-2017 at 04:21 AM. Reason: Added more to post
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Old 02-18-2017, 04:34 AM   #3 (permalink)
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Thanks Drover. Do you know how the trip computer "knows" how much fuel is in the tank?
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Old 02-18-2017, 07:47 PM   #4 (permalink)
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Everytime I fuel up I put 50 liters in the tank and get roughly 400KM. That's 12.5L per 100. During the summer I can do 450KM with 50 liters but during winter I sometimes struggle to get 300. I drive around town with a small stretch of country road. When doing 100% of highway I still get rouglhy 400KM.

When the gas light turns on I usually have 12 liters of fuel left in the tank.
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Old 02-18-2017, 09:54 PM   #5 (permalink)
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Thanks Dake
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Old 02-22-2017, 12:39 AM   #6 (permalink)
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Looks like around the same as I have....1/2 tank after 250kms is around 25 litres used - as you will see from other threads, the guage is very non-linear. I managed to get another 170kms after the warning lamp came on (E). The needle falls to just under the middle dash of the E.

Measuring actual fuel use over a couple of years now and I consistantly get 10.5 to 11.2 l/100. I use the 1/2 full point to check I have done around 250kms.

I don't worry too much about the warning lamp - but refill before I hit the 550kms mark. Of course, all this is thrown out by topping up when the fuel is at the lowest ripp-off point in the cycle ;-)
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Old 02-22-2017, 06:02 AM   #7 (permalink)
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Thanks for that mate. Seems to make sense. My only other question is, what does the range say on the trip computer when the tank is 'full'?

Last edited by Norlup; 02-22-2017 at 06:51 AM.
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Old 02-23-2017, 06:30 AM   #8 (permalink)
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Well, question answered. Filled up the tank today, when the gauge was reading empty and the trip computer showed a range of 40 ks. It took 49 litres, giving a economy of 11.2 per 100. The gauge and trip computer are telling rubbish.
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Old 02-25-2017, 12:05 AM   #9 (permalink)
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Are both of you have the manual transmission? Because I usually am at 200KM done at half tank.
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Old 02-26-2017, 05:18 PM   #10 (permalink)
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Yup - best way is to fill up your tank, reset the tip meter and then calculate actual useage the next time you fill.

My average displayed is ALWAYS better than actual (by up to 10%).

When I fill up, range is usually indicated at 550 or so.

Measured fuel consumption best was 9.5, usually 10.5 to 11.5 for normal driving.

My car is a 5 door manual.
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