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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... -
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... -
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... -
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.... -
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,... -
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... -
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... -
Saving fuel downhill 19 Sep 2011 (Ask HJ)
Is the petrol cut off to the engine when running downhill? -
Will fitting mudflaps affect fuel economy and road noise? 5 May 2023 (Ask HJ)
I’ve recently purchased an Audi Q5 and am considering fitting mud slaps as the sides of the vehicle dirty up quickly in wet weather conditions. Would such... -
Why does my car keep kicking out lots of white smoke? 16 Sep 2018 (Ask HJ)
My Vauxhall Vectra has started kicking out LOTS of white smoke. Then nothing for days and then smoke again. The water level is dropping slowly but performance... -
Is my Toyota Corolla really returning 50mpg? 19 Nov 2016 (Ask HJ)
I own a 2005 Toyota Corolla T Spirit 1.6. All evidence I find on fuel economy states 38-40 mpg, including your own "Real Mpg". I cover mostly motorway... -
Emissions Scandal - is Mercedes-Benz being investigated? 23 Apr 2016 (Ask HJ)
In the light of Volkswagen problems with the emissions scandal, why has Mercedes Benz escaped investigation? I have an 10 month old SLK AMG Sport with... -
Why is our Polo's fuel economy the same as our Audi TT's? 16 Mar 2013 (Ask HJ)
I have covered 5700 miles, all on V-Power, in our 2011 Polo 1.2TSI 105 following your recommendation. It’s a great car in all aspects but one. On a run... -
Do winter tyres have additional benefits over runflats? 26 Jan 2013 (Ask HJ)
I decided to fit winter tyres this year, and now use Avons on 16-inch steel rims to replace the original 17-inch runflats on my BMW 3-Series. As expected,... -
Fuel efficiency by time of year 3 Dec 2012 (Ask HJ)
I now have a Kia Cee'd Ecodynamics 2011 but despite economical driving (e.g. 50-55mph on motorways, smooth braking etc) it's only getting about 49MPG.... -
I know you are not in favour of supermarket fuel, but... 15 Nov 2012 (Ask HJ)
I know you are not in favour of supermarket fuel, so I decided to check it out against my normal fuel which is Shell regular diesel. I drive a Nissan... -
What's causing this engine fault on a 2002 Land Rover Freelander? 2 Nov 2012 (Ask HJ)
Any ideas please? I have a 2002 Freelander TD4 with an intermittent fuel failure. It was travelling happily then suffered a loss of power with an eventual... -
My Skoda Superb's fuel economy is excellent. 14 Jul 2012 (Ask HJ)
We recently bought a Skoda Superb 1.6 TDI. My wife and I went away for the weekend and, on our return home on 1 April 2012, emailed friends regarding the... -
Passat fuel consumption - recall has improved fuel comsumption 13 Jun 2012 (Ask HJ)
We have had a 56 reg Passat TDI140 for 4 1/2 Years and it's always averaged 45-48 mpg winter/summer and alway run really well. There has just been a recall... -
White smoke when starting in the morning 17 Apr 2012 (Ask HJ)
When I start my Mondeo the morning it smokes slightly and it has a misfire, but once I drive about 500 yards the car runs great, no smoke or misfire, then...
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