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  Leak house 31 Oct 2009 (Ask HJ)
  I have an intermittent fuel leak from the main fuel pump of my 1997 Mercedes W124 E220 Convertible. It will stay sealed, then suddenly start leaking again,...
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  Brand new car broken down and no fault found 10 Jan 2013 (Ask HJ)
  Brand new car delivered in October, chosen because of unsurpassed reliability record on warranty direct and JD Power data. Driven towards the Alps,...
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  What are these Mondeo fault codes? 17 Sep 2012 (Ask HJ)
  Engine fault codes P0251, P1211, P2288 showed up when my Mondeo diesel 2.0TDCI cut out a couple of months ago, three times within a mile after I had left...
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  FIAT of imagination 23 Feb 2011 (Ask HJ)
  I would like to make you aware of a strange situation. We recently purchased a FIAT 500 TwinAir. We get between 30mpg to 35mpg. My wife runs a 2006 Ford...
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  Can you recommend a cheap used car? 9 Jun 2022 (Ask HJ)
  I own a five-year-old Kia Venga petrol. The best I get from this car is 44mpg. So, with fuel prices increasing, I am looking to swap my car for something...
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  Why is the fuel economy in my Ford Focus 1.0-litre EcoBoost so much worse than official figures? 11 Nov 2021 (Ask HJ)
  I've just bought a 2013 Ford Focus Estate 1.0-litre EcoBoost Titanium. It is giving me about 33mpg, when the advert for urban driving says it should be...
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  Why is the fuel economy so poor in our Toyota Verso diesel? 26 Apr 2016 (Ask HJ)
  My wife drives a 2011 Toyota Verso 2.0 D4D with 60k miles on the clock. My wife drives mainly short journeys of 10 miles with a couple of longer motorway...
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  Which fuel is best for the Mazda MX-5? 12 Apr 2015 (Ask HJ)
  Having followed your advice, I this week purchased a 2010 Mazda MX-5 2.0 Sport Tech RC six-speed, which I am very happy with. The manual states to run...
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  Why is my fuel economy so poor? 30 Mar 2015 (Ask HJ)
  I bought a Peugeot 308 four months ago and have clocked up 1000 miles. My average fuel consumption has been 33mpg at an average speed of 20mph. Is this...
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  My daughter put petrol in her Audi A3 TDI - should the fuel tank be flushed? 26 Oct 2013 (Ask HJ)
  My daughter, having recently exchanged her car for an Audi A3 2.0 TDI, made the mistake of filling the car with petrol. The car was taken as instructed...
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  What's causing my Volvo S80 to emit black smoke? 22 Aug 2013 (Ask HJ)
  I own a 2003 Volvo S80 D5, but the car has been emitting a lot of black smoke after warm up. I’ve replaced the pipes on the engine, swapped the EGR valve...
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  My Mazda3 has erratic diesel consumption? 4 Jun 2013 (Ask HJ)
  My 2010 Mazda 3, 2.2 diesel 185 bhp Sport can return 60 mpg on an extra-urban round trip of say 10 miles or so but should i make a few stops on the way,...
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  Fuel economy drop on my 3 Series - why? 1 May 2013 (Ask HJ)
  I have owned an 07 BMW 320D Sport Tourer Auto from new. Until last Autumn, I was averaging 37mpg. This has fallen over the winter to 24mpg in town and...
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  Misfiring, smoking E46 BMW 320i 8 Apr 2013 (Ask HJ)
  My E46 started with a misfire then loss of power, uneven idle, white smoke and later it flooded cylinder 4 with fuel, disabling the spark plug and allowing...
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  Engine won't turn off in our SEAT Leon 5 Feb 2013 (Ask HJ)
  My wife has a 2009 SEAT Leon FR Petrol. There is an intermittant fault in that when the ignition is turned off and the key removed the engine will continue...
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  How can I tell whether a hire vehicle is petrol or diesel? 17 Nov 2012 (Ask HJ)
  We hired a Ford Focus last week but were concerned when we came to refuel the car. On opening the fuel inlet there were signs for a black fuel pump, i.e....
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  What's causing our Citroen C1 diesel to keep breaking down? 4 Sep 2011 (Ask HJ)
  We have a 2007 Citroen C1 diesel and the mileage is 2100. We bought the car new from the Citroen dealer in Perth and we have had, throughout its life,...
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  Do current emissions figures underestimate fuel economy from an emissions and a taxation point of view? 21 May 2011 (Ask HJ)
  You wrote that the issue of certified fuel economy figures is about to explode in the face of the EC. It seems to me that this is more likely to explode...
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  Spurts car 1 Aug 2009 (Ask HJ)
  I have owned my car since new. I have recently encountered a strange problem with the fuel tank. On opening the filler cap quite a large amount of air...
• Honda Civic 1 4i 1998 - Fuel type E5 or E10 31 May 2022 (Forum)
  I changed to the more expensive E10 but am unsure if I am ' pouring my money' away & can fill up with E5   .