Plug-in hybrid owners look to be trying to swerve new Government Road User Charges.
The exemption for electric vehicles ends from April, and light EV owners will pay $76 for every 1000 kilometres travelled.
Owners of plug-in hybrids will pay $53, because they also pay tax on fuel.
One plug-in owner, Peter Garlick, says he wants to remove its electric plug to avoid paying double taxes.
"So, an about 120 kilometre round trip into Nelson- I get 15 of those Ks off the mains power, and the other 105 kilometres I'm using petrol. And I'm paying more road user taxes on that petrol already."
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