Ask Honest John

Most recently answered fuel economy questions
I recently bought a 1.8-litre petrol Mazda 6. The ‘info’ button reveals I am achieving between 42 and 43 miles per gallon. How accurate are these in-car gizmos at calculating miles per gallon?
My 2002 1.9 TDI Passat estate 130 occasionally cuts out when started from cold (usually on pulling up at the traffic lights) and is slightly heavier on fuel than it used to be. Now get around 37 per...
I want more mpg from my Mercedes-Benz E320 CDI - is a bolt on chip the way to go? Some manufacturers say they improve mpg by 20% but is it true?
I have just bought a petrol engined car for the first time in more than 10 years as my annual mileage is now only around 12,000. I exchanged my 59 plate Fiat Bravo 165 Multijet Sport for a new 140 Multiair...
I want a Golf hatch, and can't pick between the 85PS 1.2, the 105PS 1.2 and the 122PS 1.4. If I drove each car equally gently; could I expect to approach the 1.2 TSI 85 PS fuel economy with the more powerful...
I am about to dispose of a 2007 Octavia 2.0 TDI DSG. The toothed belt is known to cause problems and my current mileage is now down to about 7000 a year, so I am considering a new 1.4T petrol or a 1.8...
Three weeks ago I bought a 10-month-old Mercedes-Benz B160 auto from a Mercedes dealership with 10,000 miles on the clock. I have been depressed by the high fuel consumption. I am quite a conservative...
I am wary of Skoda because of problems your readers have reported on Volkswagen Group engine management systems. I would appreciate your thoughts on Eco Drive engines. They are being put in large cars...
I wish to change my 2006 Mondeo Edge for an estate car or good alternative. As it will be my last vehicle I am looking for something with a high ride, for ease of access, and a saloon car driving position....
I am gobsmacked at your recommendation in response to the enquiry of CA from Bourne End, owners of a BMW X5. Have you actually sat in and driven, say 200 miles in your recommended vehicles? If you had...