I improved my Nissan Murano's fuel economy by 4mpg by using Shell V Power fuel.

I own 2009 Nissan Murano, purchased new, where prior to running in I averaged 24 mpg. However, now that it has covered 9000 miles my consumption has improved to 28mpg running on Shell V Power exclusively....

Thanks for presenting your true mpg figure database, and don't blame the manufacturers for trying.

Congratulations on launching a table to reflect true average fuel consumption figures (www.honestjohn.co.uk/realmpg). You cannot really blame the manufacturers. They know that in many vehicle classes,...

Where can I accurately test the true mpg figure for my 2010 Vauxhall Astra?

I am contacting you as I have exhausted all lines of reasonable negotiation over the past six months with both the dealer and also Vauxhall themselves. My 60-registered Astra 1.7CDTI achieves the following:...

I achieved 63.7mpg in my 2004 Astra Estate diesel by restricting my speed to 60mph on fast roads.

Our car is a 7-year-old Astra Estate 1.7CDI now at 60,000 miles. I always run from 'tankful' to 'tankful', resetting the odometer to zero and checking the consumption each time. Living in a village with...

Why doesn't my friend's SEAT ST achieve its quoted fuel economy of 80mpg?

I have a friend who lives near Stirling, three miles from the nearest main road. He does not receive the Telegraph and so missed out on your wisdom and replies regarding cars not meeting their advertised...

Will we see any benefit from using the Toyota Yaris Hybrid over long journeys?

We are thinking of trading our Toyota Yaris diesel next year for the new Yaris Hybrid, which is coming soon. However, talking to our mechanic and the Toyota salesperson, we are advised that benefit from...

Why is my wife's new A Class Mercedes-Benz returning fuel economy 25 per cent below the advertised figures?

I bought a new Mercedes-Benz A160 Blue Efficiency model for my wife's use a year ago. From the outset it was obvious the fuel economy was going to be nowhere near that advertised. It has been in to the...

My Jaguar XF returns 40-41mpg which is close to the official figure of 42mpg.

Some manufacturers seem to manage to make their cars deliver closer to the official fuel figures than others. As the owner of a Jaguar XF diesel I get a steady 40 - 41 mpg on mixed (60 per cent dual carriageway...

My Mercedes-Benz E220 Coupe returned almost 60mpg on a long trip - which cars can beat that?

Your correspondent LD of Weybridge should ditch his Fiat 500 TwinAir and buy a Mercedes-Benz. I have just driven my four-month-old E220 Coupe from Northallerton to Winchester, at motorway speeds throughout,...

Do current emissions figures underestimate fuel economy from an emissions and a taxation point of view?

You wrote that the issue of certified fuel economy figures is about to explode in the face of the EC. It seems to me that this is more likely to explode in the face of the motorist. If, as regularly experienced,...