Ask Honest John

Most recently answered fuel economy questions
In the light of Volkswagen problems with the emissions scandal, why has Mercedes Benz escaped investigation? I have an 10 month old SLK AMG Sport with the 2.1 diesel engine. Mercedes claim 70mpg for this...
I bought a new Land Rover Discover Sport in January. I've covered 3300 miles, but struggle to get anywhere near the official 53mpg. In fact, my average ecnomy is closer to 35mpg.
I need a car with great fuel economy for my 120 mile per day commute. It must be reliable, comfortable and suitable for my family. Budget circa £8000, but could stretch it for the right car.
There are as yet no Real MPG figures for this car. I understand it's based on the Nissan Qashqai in terms of engines and chassis. The Qashqai models seem almost identical in Real MPG terms so is it reasonable...
I would like to buy a Ford S-MAX petrol. Could you advise which engine is the better buy. I have always thought the 2.3 engine was uneconomical, and not a powerful as the straight 2.0-litre. Which unit...
My Vauxhall Zafira 1.7 diesel (13 reg) used to do about 45 miles to the gallon around town but after my last service it does only 38 miles to the gallon. Can you tell me why this has happened?
Three weeks ago I bought a Mazda 6 2013 sport nav estate. It's a 2.2 175PS diesel auto. Overall I am very happy with the car. However I am a bit concerned about the fuel economy. At the very best I am...
I own a 2009 Volkswagen Passat 1.6 TDI BlueMotion and recently I realised that the fuel consumption has increased considerably. I used to do 49 mpg easily and now I struggle to do 42mpg. Last week the...
For the last 18 years, I have kept a record of fuel consumption in a spread sheet of the cars I have driven, from 1997 to 2002 when I drove company cars. After I retired I kept the spread sheets going....
I have submitted the life-time petrol comsumption of our Ampera three times now (most recently, a few minutes ago), but it does not appear in your results (which are still showing only three submissions)....