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  Can I clarify how biofuels are processed? 28 Apr 2012 (Ask HJ)
  I read your explanation regarding the emulisification of biofuels and think you have mixed up the two major fuel types: Bioethanol (ethanol from a biological...
• Classic cars,bikes older Outboards Chainsaws ETC - Ethanol in Fuel ( by EU Directive ) 11 Mar 2012 (Forum)
  Yet ethanol is also a powerful solvent that, without a suitable additive, attacks many fuel system components including zinc and galvanised materials, brass, copper, aluminium, seals and hoses, cork, polyurethane and epoxy resins. In other words, almost everything used in a vehicle made more than about 20 years ago.
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  Can a petrol pump temporarily malfunction and provide the wrong fuel? 12 Jan 2012 (Ask HJ)
  Some 18 months ago I filled my car at my usual Tesco petrol filling station using the diesel pump and getting a receipt for diesel. After about 800 yards...
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  Can I alter my 2002 Ford Ranger's wheels and/or gearing for better fuel economy when cruising? 22 Oct 2010 (Ask HJ)
  I own a 2002 Ford Ranger pick-up and use it for work and pleasure. I have noticed that on a motorway run, at 70mph it is running at just over 3,000rpm....
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  How can I tell whether my Mitsubishi Chariot has a piston or ring problem? 7 Jul 2010 (Ask HJ)
  I have a Mitsubishi Chariot 1996 2.0 auto and would like to know how I can tell if I have a piston or ring problem. The last thing I want is to take the...
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  I had no idea how much low tyre pressures can affect fuel economy. 30 Jun 2010 (Ask HJ)
  Seven weeks and 3000 miles after I took delivery of a new Skoda Octavia Scout 1.8 TSI I decided to check my tyre pressures. They were all too low by about...
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  No particulate place to go 22 May 2010 (Ask HJ)
  I've read with some dismay of the shocking stories of Mazda 2.0 diesels spewing fuel into the engine lubricant with understandable and catastrophic results....
• Vauxhall Corsa D (2006 - ) - Unexpected poor fuel consumption figs. 24 May 2008 (Forum)
  The car was superb and I had no issues with it. In September my circumstances changed and I got a new job with a company van with fully expensed fuel etc so I decided it was time to give my Astra up :-(. During this time my Girlfriends car decided to pack in and we decided to get rid of the astra (Mainly due to the fuel consumption) and downgrade. i went to Vauxhall and asked what they could do for me regarding a possible swap for another Astra (maybe a diesel?).
• `Luxury bloat` small cars, to efficiency priority? 2 May 2008 (Forum)
  It seems that current European `small` cars are fine in the current (or was that last month) want for `luxury small`, but are still larger and bloated in weight than they could be if fuel economy and low purchase cost were paramount. Will the new fuel prices bring about austerity super economical models? Fuel consumption before weigh, bloat and.. dare I say it, aircon ;) Any thoughts?
• Diesel, Cold, stop start fuel consumption figures 20 Dec 2007 (Forum)
  This must be a typical journey for many people in winter, in particular those retired or running children around to school etc. But why do you rarely hear of the big fuel savings on cold, short journey, stop start use with diesel? (Diesels driven care that is and not booted forward at every gear change with maximum torque) Could it be that the official fuel consumption tests flatter Petrol?
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  Is a loss of power in my Audi A3 a symptom of the emissions fix? 15 Mar 2017 (Ask HJ)
  Since my Audi A3 had it's emissions fix it has had problems with the engine management system light flashing intermittently and the engine losing power....
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  Shell V Power Nitro+ 28 Jan 2016 (Ask HJ)
  Hi John, I've enjoyed your website and insight on matters motoring for some time; we occassionally differ (I love my DSG gearbox for example) but its...
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  What could be causing a fuel gauge fault in my Volkswagen Polo? 21 Dec 2013 (Ask HJ)
  I would be grateful for your comments regarding the "niggles" I'm having with my 2011 Volkswagen Polo 1.4 Match. On one occasion in July I turned on my...
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  Why is my wife's new A Class Mercedes-Benz returning fuel economy 25 per cent below the advertised figures? 28 May 2011 (Ask HJ)
  I bought a new Mercedes-Benz A160 Blue Efficiency model for my wife's use a year ago. From the outset it was obvious the fuel economy was going to be nowhere...
• Chrysler Voyager - car keeps breaking down with no prior warning when driving along 26 Sep 2017 (Forum)
  This could be 10 miles from home to 100 miles away from home it just so unpredictable as it happens without any notice, i think this is extremely dangerous as if i was on the motor way my car just stops dead without any notice I tried a new fuel filter but the same kept happening i had it towed to a garage where they put the machine on a diagnostic machine - everything came back fine?? Although the mechanic could hear the tank kicking in he said that the fuel pressure was low- later found out this was due to a crack in the fuel filter housing and leaking, got this changed with a brand new hosuing unit but still no joy We have had a new fuel pump (the one underneath the car next to the tank) fitted drove perfect for a day seemed to have more power then 10 minutes from home the following day the same happened again :( my husband says when it breaks down it always seems as if the car is out of fuel (diesel) although we never let the car get below a quarter of a tank.
• Volkswagen polo bluemotion 2010 - Help my fuel injectors busted a second engine! 10 May 2017 (Forum)
  About a month ago my car broke down with a billowing of white smoke. It was transferred to a fuel specialist where they said one had became trapped open causing unburnt diesel to flood the engine, they replaced this fuel injector (£500) and then transferred my car to another specialist to have a new engine put it.
• ford focus 1.8 tdci - injector/fuel pressure problems? 3 Mar 2014 (Forum)
    i took it to my local diesel specialists,who came highly reccommended who done a full diagnostic and leakage test. the fault came back to injector no 1 exess leakage and they advised replacing no 1 injector and also replacing the fuel filter. this i did at a cost of £220 for injector supply and fit and the fuel filter and the diagnostic was £65.  upon collecting the car yesterday it seemed to run fine until the exact same symptoms started again!
• Volkswagen Polo III (1.4 petrol) - Engine got wet in floods and wont start at all. 8 Jan 2014 (Forum)
  Is there anyway of checking whether fuel is getting through (I can hear the fuel pump working as normal)  or not, just in case the fuel injection electrics are playing up because of the water??   Many thanks in advance,   Dave
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  Engine problems with T25 camper van - what's the cause? 17 Sep 2013 (Ask HJ)
  I’m having some problems with my Volkswagen T25 camper van. It has started misfiring and losing power; the RAC cleaned the jets and things improved, but...
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  BMW X1 Efficient Dynamics fuel consumption 12 May 2012 (Ask HJ)
  I have a BMW X1 2.0 diesel manual efficient dynamics model I have recently bought from a dealer. The official combined fuel consumption figure is 62.8...