New Delhi, Jun 11: The government has waived excise duty on variants of ethanol-blended petrol, a notification by the finance ministry said. The duty waiver is applicable on E22, E25, E27 and E30 variants of petrol. In the notification, the ministry said excise duty will be 'nil' on petrol with 22 per cent, 25 per cent, 27 per cent and 30 per cent ethanol blend.