Ask Honest John

Most recently answered co2 emissions questions
Mercedes' own website shows emissions for this engine at 109 g/km. However, their paper brochure shows them as 115 g/km. Asked for clarification, the dealer just said 'the brochure says 115', which missed...
Are DPFs a legal requirement? What do you think of ECU-Flash's DPF removal service, please?
Please could you explain to me why the electric car is deemed to be ‘pollution-free’? Charging a re-chargeable battery is a very inefficient process and the electricity used to re-charge it is subject...
I am considering trying Terraclean performance tuning on my BMW 118d, in the hope of improving emissions and improving performance by removing engine carbon deposits. Do you know if such a treatment is...
I have always been a Volvo fan and own currently a top-end 2002 Volvo 2.4T V70 that needs replacing. On looking around for a V70/XC70 replacement I find, to my utter disappointment, that below the 304PS...
We’re a family of five looking to downgrade from two cars to one. We only have £8000 to spend and - in order to keep my £155pcm work car allowance - the new car must have less than 160g/km of CO2 emissions....
It is now time to change from my nine-year old BMW 525 diesel. I am retired and do about 4000 miles per year. I do lots of short journeys of around seven miles, with very occasional longer trips. The dealer...
I will soon need to replace my Volkswagen Golf 1.6 Auto, which will be 11 years old shortly and has over 120,000 miles on the clock. I would much appreciate your advice in choosing a similar sized, fully...
I appreciate that diesel has many advantages but I have always been concerned that even with the best systems, NO2, PM5s and more especially PM2.5s could be a health hazard. Now, according to ‘Autocar’,...
Your real mpg lists at www.honestjohn.co.uk/realmpg make very interesting reading. I note that the real mpg values for the 2003 Avensis and the 2009 Avensis are almost the same (1.8 engine), yet the later...
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