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  Can I run 87 or 89 octane fuel in my Mazda CX-7? 24 Aug 2013 (Ask HJ)
  We recently purchased a low mileage Mazda CX-7 as a second car. The 244HP 2.3-litre turbo engine is very thirsty and the manual calls for 91 octane fuel....
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  Fuel pressure problem 9 Jul 2011 (Ask HJ)
  I have a fuel fault on a 2005 Vauxhall Combo 1.3 CDTi. I have no fuel pressure on cranking sometimes. It takes longer than usual for the fuel pump to pressurise...
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  Should I buy a bi-fuel car? 10 Jan 2024 (Ask HJ)
  I'm wondering if it would be worth my while buying a new Bi Fuel vehicle. I have a LPG garage 3 miles from me, but will it still be there considering the...
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  How can I remove water from my diesel car's fuel tank? 15 Jan 2023 (Ask HJ)
  There seem to be a bunch of claims out there about the best ways to get the water out of my diesel fuel tank. Can you recommend any?
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  Why does coasting downhill use more fuel than staying in gear? 15 Sep 2012 (Ask HJ)
  The leaflets sent out with tax disc renewal notices headed “Be a smarter driver and save money” give the advice “Stay in Gear. Don't coast downhill or...
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  Bio ethanol problems 24 Jan 2012 (Ask HJ)
  A number of classic car owners have noted that their fuel hoses have degraded as a result of modern fuel containing bio ethanol. This also applies...
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  Fuel additives 15 Oct 2011 (Ask HJ)
  I have started filling my 2007 diesel Passat Estate (2.0 140ps) with Total Excellium - currently on my third fill, and have noticed a bit better pickup...
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  Fuel economy & emissions 11 Jan 2011 (Ask HJ)
  I traded in my A3 2.0 petrol turbo manual (emissions 186 g/km) for a 3.0 3-Series BMW auto (emissions 170 g/km). The BMW seems to use more petrol, significantly...
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  Why is my Renault fuel gauge incorrectly showing the amount of fuel left since the recall work was done? 13 Feb 2017 (Ask HJ)
  My wife has a 2015 Renault Twingo TCE Dynamique S which I think is a great little car. However, since having the Renault recall work to have the bonnet...
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  Can I reject my Mercedes-Benz C-Class because it doesn't match quoted fuel economy figures? 30 Jul 2010 (Ask HJ)
  I cannot achieve Mercedes-Benz's quoted fuel consumption figures for my new C250 CDi. Despite many of my trips being long distance, the average fuel consumption...
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  Where's the fuel cut off switch on the Daewoo Matiz? 22 Oct 2013 (Ask HJ)
  For some reason my 2003 Daewoo Matiz won’t to start. The alternator belt went recently and it had to be towed to a local garage. However, since the new...
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  Will always filling up my fuel tank only halfway mean better fuel economy? 20 Jan 2020 (Ask HJ)
  I've just read an article saying that you should always fill fuel up to the top rather than filling halfway or less otherwise it could create issues in...
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  Does my RAV4 really need a whole new fuel pump to replace a sensor? 4 May 2013 (Ask HJ)
  My 2007 Toyota RAV4 T180 D-4D is sitting in the Toyota garage whilst they scratch their heads trying to work out why all the warning lights come on saying...
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  Fuel tank collapsed due to a vacuum pressure 20 Oct 2011 (Ask HJ)
  A vacuum pressure built up in the fuel tank to the point where it collapsed. The vacuum was evident when the fuel tank filler cap was removed at the...
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  Will performance fuel improve my Ford Focus? 18 Jul 2013 (Ask HJ)
  I have heard a lot of good points about using performance fuel, but I assume it is only really an advantage if using it with a performance car, is this...
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  How often should I replace the fuel filter on my car? 21 Oct 2023 (Ask HJ)
  How often does the fuel filter on my MINI Countryman 1.6d 2013 need changing?
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  Is the diesel fuel that I buy in a supermarket any different from Shell or BP? 10 Sep 2018 (Ask HJ)
  Is the diesel fuel that I can buy in a supermarket filling station really any different that the diesel that I can buy from a Shell or BP garage?
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  DPF and fuel consumption 21 Jun 2015 (Ask HJ)
  I had a DPF filter regeneration last week at an authorised dealer garage and I have noticed increase of fuel consumption from around 11 l/100 miles to...
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  Where can I find the fuel pump on a Renault Laguna? 25 Nov 2014 (Ask HJ)
  I think the fuel pump has packed in on my Renault Laguna. Where is it and how can I access it?
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  Best cruising speed for fuel efficiency 17 Jan 2012 (Ask HJ)
  I would like to know the optimum speed to use for the least fuel consumption in a Toyota Corolla (2000). Equally, are there things I need to do generally...