An unnamed team principal has criticised Formula One's so-called 'green' energy-recovery KERS technology.
In the end the fuel consumption is higher
"It gives us a green look," the boss is quoted as saying by Frankfurter Allgemeine Sonntagszeitung newspaper.
KERS gives drivers a power 'boost' after collecting heat energy from braking and charging a battery.
"In reality, KERS is used only for acceleration and forces up the (car's) weight, so that in the end the fuel consumption is higher.
"That's not to mention the question of what happens to the batteries when they're finished," the unnamed F1 chief added.