2014 corolla fielder

#1
Guys i have a 14 corolla fielder hybrid, it does not uses the EV mode during the drive. The battery charges properly and discharges okay too. Also when the car is at a complete stop the EV mode comes on after long time. Did get the CVT oil change but it has no difference. Also once i lift my foot off the accelerator while driving on 2k RPM it goes up to 3k RPMs and making a very loud sound slowly drops down and stays at 1k RPMs.
It was driving okay and giving me a mileage of 21 km/l to a minimum of 18 km/l. But all of the sudden it has changed and giving an average of 11km/l to 12km/l.
 
#2
Sorry to say, but this sounds like an engine management problem. Has the dealer checked your computer?
I only present this as an option because I've had a computer go bad on a 2006 model. The car did some goofy stuff and then went into a "limp home" mode. Thankfully this happened when I was near the dealer, so we dropped it off and left in a loaner.
 
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