Please help - MPG crash - Vauxhall Antara Forums
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post #1 of 16 (permalink) Old 12th July 2016, 11:15 Thread Starter
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Hi all, Good to be part of this forum and thanks in advance if you can help me, as I will try to do likewise for you. Ok - I've just bought a 2013 Antara diesel 4WD and wasaveraging around 40mpg in normal easy rural driving on ECO mode, then every 500 miles or so the economy crashes to about 20mpg (as indicated on the instantaneous fuel economy readout)for about 30 miles. Is this normal ? Yesterday the car used up 80 miles of fuel in just 10 miles of driving and the engine oil life monitor came on briefly.(although this did not come on on previous occasions).

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post #2 of 16 (permalink) Old 12th July 2016, 12:23
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Sounds like textbook diesel particulate filter regeneration (DPF). There are other threads on the forum about this but basically, the car has a DPF which catches and stores the dirty soot particles. When this fills up, the car goes through a cycle where it dumps extra fuel to increase the temperasure which burns the soot off leaving only ash particles - and the cycle starts again.
The regeneration in the Antara appears to be fairly crude and does use a lot of fuel.
This appears to be programmed for every 500 miles (although I have seen this recently at 300 miles 😨.
Just something to live with as part of Antara ownership.
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post #3 of 16 (permalink) Old 12th July 2016, 19:31
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Hi, 99.9% regen is occurring. You might think that you have used 80 miles worth of fuel, but what you MPG/range is saying is that if you carry on at the reduced rate, that is the range of your car. After the regen, you will see that the range will start to climb.
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post #4 of 16 (permalink) Old 12th July 2016, 20:28
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Absolutely normal regen process, can be speeded up by keeping the revs up a bit if it is a manual gearbox. Also, oil change time probably getting close.
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post #5 of 16 (permalink) Old 13th July 2016, 06:03 Thread Starter
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Phew, Thanks for the advice, thought i might be looking at a trip to the garage.
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post #6 of 16 (permalink) Old 13th July 2016, 17:39
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Definately sounds like the dreaded regen.Once completed, all goes back to normal.
I am getting naround 44mpg average

2015 SE NAV in White
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post #7 of 16 (permalink) Old 15th July 2016, 07:14 Thread Starter
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Thanks. Mine's a popemobile in Summit White.
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post #8 of 16 (permalink) Old 15th July 2016, 21:26
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Are you sure you are driving an Antara Clive I am currently getting 29mpg
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post #9 of 16 (permalink) Old 16th July 2016, 08:00 Thread Starter
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More than 29 mpg is achievable depending on driving conditions. If you're flooring it all the time then I wouldn't expect to get much more than the mid - 20's. However there are techniques you can use to improve fuel economy.
Increasing the tyre psi's to 38 all round will help, especially if you drive in ECO mode.
Driving downhill or coasting (in gear !) towards, say a town with a30 mph sign you can come off the throttle completely for 100 yards or more before the speed limit sign, the car will maintain speed by itself, slowing gently to 30 mphwithout using any fuel. This avoids braking but may take practise.
If you can, try smoother driving so anticipate more by looking farther ahead, this will help economy as you will be changing gears less and reducing the frequency of harsh braking / acceleration.

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post #10 of 16 (permalink) Old 16th July 2016, 10:11
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Auto or Manual?
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