@Mark
Usually, a car will have a 'halfway' point on the ignition that turns off the engine but leaves the electrical systems running. In this state, the wheel is also unlocked. The Reporter said 'turn off the engine', not 'turn off the car', which is, admittedly, splitting hairs. It does imply this 'halfway' state, though.

Eric, Milwaukee, WI, USA

Be careful when turning your engine off while driving, some cars initiate the car's stearing lock when the key is turned to an off position. I think it is a tad irresponsibleof the reporter to not point this out!

Mark McLaughlin, Leicester, UK, UK

The best way to drive economically is to offer to collect your mates on the way to and from work every day. This makes a lot of sense, from an ecological point of view, and the real boon to your finances is that you charge each of them £20 per week . . . with three passengers, you make £60 p/week and you NEVER have to pay for your petrol again. Now THAT'S economical driving!

Tom, Blackburn, UK

We must all slipstream the vehicle in front. Keeping no more than a six foot gap will save fuel; there will be less need to use the gears and in the event of a collision, there will only be a six foot impact and therefore you are likely to survive.

Adrian Shurmer, Great Harwood, United Kingdom

I drive everywhere as fast as possible, using a large 4.2 litre V8, 420 horsepower saloon. I get around 18mpg on average. It's fantastic. I recommend accelerating around corners, braking hard (to check they still work) and overtaking at every possible juncture.

Speedy Gonzales, Puerto Banus, Mexico

"drop into neutral, turn off your engine, take the turn at 50mph and freewheel home [...]"

This seems crazy for a couple of reasons -- surly your power steering and power breaks could go out if you cruse in neutral for too long and if you turn the key one notch too many you could engage the steering lock if you had to swerve.

Etienne , London, UK

i dont see how a car being driven in the Mountians is getting 168MPG.. has there towing being involved.. the car has a smaller motor then the old civics, a 1 liter 3 cylinder.. how can a motor with such low torque, make it up an mountian only using the electric piece.. im sorry but i find 168MPG actually being true.

Thomas , dawson, georgia