India, Oct. 26 -- The ministry of road transport and highways (MoRTH) has notified amendments to the Central Motor Vehicles Rules, adding E100 as an approved fuel option alongside E85 for flex-fuel vehicles. E100 refers to fuel with 100% ethanol content - or near-100%, since small quantities of water improve combustion.

The notification, issued on October 23 and published in the official gazette on October 26, comes into immediate effect. This follows draft rules published on April 27, after which the ministry reviewed public objections and suggestions before issuing the final notification.

Flex-fuel vehicles are designed to run on any mixture of ethanol and petrol, from pure petrol to E100, with onboard sensors adjusting engine paramet...