Quote:
Originally Posted by winkosmosis
It always takes less energy to change direction with a larger radius... compare coasting your car through a 90 degree corner vs a wide sweeping curve.
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For the largest part, that's the tyres' drag increasing in order to make the sharper turn.
Or indeed, any turn. My fuel consumption always goes up in a constant speed turn - say on the motorway.
Then there's aero drag increasing from going through the air in a skewed way rather than straight as the car was mostly designed to do.