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Why has Shell's 'fuel saver' diesel increased my Chevrolet Cruze's consumption from 29.4mpg to 27.86mpg? 3 Apr 2011 (Ask HJ)
I have now run a Chevrolet Cruze diesel auto for over one year. Since Shell introduced "Fuel saver" diesel, my consumption has increased to 27.86 mpg average... -
You're wrong about the effect of coasting on fuel economy. 29 Aug 2010 (Ask HJ)
Twice in the past year you have answered a similar question to 'is it economical to coast in neutral down hill'. Both times your answer is wrong! Of course... -
Stupid fuel 15 Aug 2009 (Ask HJ)
I recently did what appears to be what an ever increasing number of diesel fuelled cars owners are doing in that I filled my diesel Focus with petrol.... -
Was I missold a car because it's not getting the mpg I was told? 22 May 2020 (Ask HJ)
What do the WLTP phases mean in real terms? Is the extra high phase just motorway driving? Basically, I bought a new Hyundai Kona 1.6 hybrid as I wanted... -
Fuel contamination - how did it happen? 26 Oct 2013 (Ask HJ)
I am totally mystified as to how my diesel Ford Mondeo got contaminated with petrol. Last week I filled up with diesel at my local supermarket and drove... -
What's the most effective way to clear a DPF? 21 Apr 2025 (Ask HJ)
Motoring magazines often refer to taking the car for a fast run to clear the DPF. Surely a better way would be to drive in 4th or 5th gear with increased... -
Which is cheaper to run, a hybrid or an EV? 22 Sep 2023 (Ask HJ)
Which is the cheapest fuel cost, a hybrid doing 66 mpg or a full electric car? -
Many years ago I purchased two jerry cans and filled them with diesel - is the fuel still okay to use? 15 Jul 2019 (Ask HJ)
During the last fuel scare many years ago I purchased two jerry cans and filled them with diesel. The cans have not been opened. Is the diesel in them... -
Will fuel stored in a metal cannister for two years still be okay to use? 5 Dec 2018 (Ask HJ)
I keep 10 litres of unleaded petrol in an approved metal cannister in my car boot for emergency use. As I keep my tank topped up, the contents of the can... -
What lead additive can you suggest for our 1977 MG Midget? 12 Feb 2018 (Ask HJ)
We have a 1977 MG Midget owned from new with 45,000 miles on the clock. The engine is original and we've been using Castrol Valvemaster Plus additive.... -
Vauxhall Astra engine management light - what does it mean? 9 Nov 2016 (Ask HJ)
I need to sell my 2006 Vauxhall Astra, but the engine management light stays on all the time. It was mentioned on the MoT advisory, but it passed anyway.... -
VAG EA189 emissions defeat software fix - seen this update? 29 Oct 2016 (Ask HJ)
Have you seen this? The EU are worried about VW's fix. Reuters: EU fears VW diesel fixes could damage engines: Spiegel. http://google.com/newsstand/s/CBIwlYulmDA Keep... -
Real MPG and real emissions 10 Oct 2016 (Ask HJ)
Some friends are looking to change car soon. They are obsessed with emissions issues and look for low MPG cars with low carbon. Their current car (Smart)... -
Peugeot Boxer fuel pump failure 8 Oct 2016 (Ask HJ)
I need help with my Peugeot Boxer camper van. The vehicle is a 2008 model and has a full service history. In brief, the high pressure fuel pump has failed... -
Which SUV is most economical? 2 May 2016 (Ask HJ)
We currently have a 2015 automatic Mitsubishi L200. The fuel consumption is awful (max 30mpg). I do around 20,000 miles per year and would like something... -
Panda Twinair - Are they fun to drive? 13 Apr 2016 (Ask HJ)
I currently have a Fiat Panda 1.2 with 60PS and it's great, but I'm looking for a newer car. Having read all your reviews on small city cars, I've found... -
Filled diesel car with petrol - what damage have I done? 2 Apr 2015 (Ask HJ)
My father-in-law recently filled his 2010 Mazda 6 diesel with petrol. After driving up the road, the car stopped and wouldn't restart. He was towed into... -
Will performance fuels fix my car's misfire? 8 Jan 2015 (Ask HJ)
My BMW 3 Series Touring sometimes misfires and starts jerking (kangaroo style), on a trailing/light throttle about 1500rpm as though its in too high a... -
Peugeot 205 refuses to tick over 3 Oct 2014 (Ask HJ)
I own a 1984 Peugeot 205, but it refuses to run for more than 30 seconds. I seemed to have checked everything, even had wiring loom apart, but haven't... -
Can you recommend a nearly new family hatch? 12 Mar 2014 (Ask HJ)
My wife has owned a Honda Jazz 1.4 from new for eight years and is looking for a replacement that is quieter, more comfortable and fuel efficient. The...
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