Ask Honest John

Most recently answered fuel economy questions
We have recently bought a new KIA Venga 3 automatic for which the consumption figures were quoted as 48mpg for a long run. We've never had trouble achieving the claimed for mpg in any car in the past....
Just to add to the debate about the 500 TwinAir, my daughter has been running one in London for a year now, and has done 5000 miles. Average fuel consumption is 33.3mpg according to the computer - and...
I own a Volvo XC60 D3 Manual Drive, which I bought new in October 2010 and which has completed 12,000 miles of almost exclusively extra urban runs at 60-70mph in sixth gear. Whilst it is a lovely car in...
Further to our brief correspondence before Christmas concerning the increase in my Toyota's Verso D-4D’s diesel consumption, I'm pleased to report that Shell V-Power, as you recommended, seems to have...
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 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...