Ask Honest John

Most recently answered fuel economy questions
I have a 2003 Volvo XC70 diesel auto estate which I have owned from new and which has a little over 60K miles on the clock. It has generally been reliable, but has recently required both front coil springs...
We have owned a 1989 Volvo 740 estate from new and now want to buy a relatively new used car (or a very low priced new car) to replace it. The new car must have a low fuel consumption. Medium sized, well...
I have recently changed to a new C-Max 5-seat 1.6 diesel. This is my first diesel and I am grateful for several tips via your column, particularly the recent one about letting out the clutch at idle revs...
I have recently bought a Skoda Fabia Greenline II estate, having run a Greenline I estate for nearly three years and easily achieved the stated combined mpg of 68.9. It was therefore with confidence that...
I have received a flier for an ECU-remapping service claiming to improve fuel consumption by up to 20% - www.ecu-remapping-service.com. It is not cheap, about £250.00, but as I do 20,000 miles per year...
The article comparing diesel and petrol Fabias was very interesting but was probably not how most people drive most of the time. I am trying to choose between two Octavias: the 1.2 TSI petrol (currently...
I have usually used only BP Ultimate diesel in my Land Cruiser, but I have recently tried the Shell V-Power diesel. I am not totally sure but I appear to be getting a couple of miles per gallon extra with...
My daughter has used Lucas upper cylinder lubricant as a fuel additive with her Honda Civic 2.2 cdi and experienced much better mpg figures. Would this be OK to use with my Audi A6 3.0 se TDI quattro automatic...
I am looking to buy a small-medium size car. I currently drive an automatic Corsa (07 plate) but I am finding it only does 40 mpg. The car needs to have room for an average size wheelchair in the boot...
I am considering buying a Polo 1.2TDI (Not the BlueMotion). Is it chain-cam? I assume as a three cylinder diesel it is a little rough and noisy, but is there anything else against it as the mpg figures...