He started out sober but got drunk as the night wore on, the court heard.
Jaxon Corfield pleaded guilty in Whanganui District Court on Tuesday to one count of driving with excess breath alcohol.
Police prosecutor Rachel Willemsen told the court police pulled Corfield in Palmerston North.
When tested he blew a breath alcohol reading of 719mcg.
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He told police he was driving his friends for the night and been sober when he started.
Judge Dugald Mathesen fined him $850 and disqualified him from driving for 6 months.