eco mode problems
 

Hi All,

I bought a 2014 Mitsubishi Outlander back in October 2018. It only had 27,000km on it. I have been noticing an issue with using eco mode on the highway at high speeds, it drags a bit and RPM's go up to around 4. This doesn't happen in 4wheel drive mode. I have been using high end gasoline only in the vehicle. Any ideas what may be the problem? Is it drivetrain? There is currently approx 34,000km on it now.
Thank you :)