Analysis - Economists say Labour appears to have underestimated its $65m pricetag, and National's claim the policy could cost as much as $1.6b is "utter nonsense".

Analysis - Economists say Labour appears to have underestimated its $65m pricetag, and National's claim the policy could cost as much as $1.6b is "utter nonsense".

As Kiwis continue to wince at the petrol pump, Labour has swooped in, but some say the maths doesn't add up.