Does the 2011 Mahindra TR40 need premium gas?

No. The EPA rates every 2011 Mahindra TR40 engine on regular gasoline.

Can the 2011 Mahindra TR40 use E85?

No. None of the 2011 Mahindra TR40 configurations in the EPA listing is flex-fuel.

Every 2011 Mahindra TR40 engine in the EPA listing runs on diesel.

1 EPA-certified configuration listed for the 2011 Mahindra TR40.
Regular gasoline is what the EPA rated it on - paying for premium buys nothing unless the manual asks for it.
None of the listed engines is flex-fuel, so do not use E85.

2011 Mahindra TR40: every EPA-listed configuration
Engine	Transmission	Drive	Rated fuel	E85
2.2L 4-cylinder turbo diesel	6-speed automatic	4WD	diesel	No

Source: U.S. EPA / DOE fuel economy data (fueleconomy.gov). Each row is one certified configuration; a trim or option not sold in a configuration is not listed.

As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.