Ask Honest John

Most recently answered fuel economy questions
My 320 Sport 177 diesel, a 2008 model with 16,500 miles on the clock, does between 47 and 54mpg. This is driving in a saintly fashion. The figures quoted by BMW are a myth and unachievable. Each 320 diesel...
My wife is looking at downsizing from a Mercedes-Benz C250 TD. We have looked at various options and feel the Toyota Yaris is most suitable. We have always had diesel cars but the salesman is advising...
I friend of mine has just had a fuel conversion magnet fitted to his 1.0-litre Nissan Micra, and says that the engine runs sweeter, the performance is increased and fuel consumption is up by about 7 per...
I now live in France and have done for about three years. I still though think of fuel consumption in mpg. Trouble is, all I can get is the rather unwieldy l/100km. I've tried all the conversion factor...
I've just replaced my W211 model E-class 220CDi with a September 2009 reg W212 model CDi, choosing the new model largely on the basis of the promised fuel efficiency. On mixed motoring - and I'm quite...
Last November, on your advice, I used scrappage to buy a Hyundai i10 Comfort. With one exception I have been delighted with everything about the car. It is lively, perhaps too lively for an octogenarian...
I would like your help/advice. Last September my daughter bought a new Corsa 1.2 Active 5 door, at the time the salesman said the car would get 48 to 60 mpg. The car has covered 4,000 miles and the best...
I have made a New Year resolution to never fill my tank more than half full. My thinking is that I will be making a smaller interest-free loan of tax to the treasury and if everyone did the same the tax...
Further to the information that you gave to the Mazda owner last week, I would like to add the following in your defence. The owner did not state what mileage he had covered. Generally, engines tend to...
My company car is due for replacement later this year and with fuel price increases due to continue I need a vehicle that is frugal. My annual mileage is approximately 30,000, which is split 80% motorway...