Then there are the number of distance runners with asthma who take medication that has performance-enhancing effects.

As confidence has declined, so has performance.

But flex-fuel allows for any mix of gasoline and ethanol and has performance similar to gasoline vehicles.

Minister of Agriculture Damien O'Connor has expressed confidence in Fonterra but admits it has performance issues to deal with.

And when conditions allow, it has performance that edges close to what one would ordinarily only experience in a supercar.