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The worst thing you can do is to try to keep at a given speed.The actual optimum speed depends on the engine design and the gearing. To get the best mileage out a litre of petrol you freewheel down hills, you keep a big space behind the car in front and you use the brake as little as necessary. You NEVER overtake! You have to drive like a pain in the backside for other road users!
Dear All,Like my car ?[attachment=2528]Nice eh ?...being delivered next Tuesday I..(I'm getting the dayglo Pink version with fluffy dice !...and a sticker in the back that says ' My Other Car is A Skateboard !)I remember reading fuel economy stats where they would give you the figure of mpg at 56mph ?....I don't think they do this nowadays.....but I did wonder why they chose that speed !..was it just an average ?....or was it a generally recognised speed where a car travels at it's most efficient ?If not...is there a recognised speed applicable to all cars or is it all bunkum ?...and that each car has it's own most fuel efficient running speed due to all the many variables.so.....where did the 56mph figure come from ?and is there a recognised fuel efficient speed applicable across the board to all cars ?whajafink ?
Staying as close as you can to the car in front is far more efficent.
If you take your foot of the accelerator, the engine will keep turning and it won't use any petrol due to the transmission causing a braking effect.