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12/31/2104 Temp 26F. Time about 7am. Driving on local road after backing out parking lot after 12hour parking: About 25MPH-40MPH, I did not speed up and the gas pedal remained the same, and suddenly a huge engine noise came on (later realized it was the the engine revving up highly) but the car did not speed up. Released the gas pedal, applied the same amount of pressure of the gas pedal (87% still to go more if pedaling all the way to the metal), car was still rolling, and the same high engine revving up. I dropped the speed down to about 10MPH, and slightly apply the gas, and a few seconds later the same high revving engine came on. Released the gas pedal, and repeat until I could find the shopping area to stop. At stop in the parking lot, turned the heat to max for 5mins, after that, turned off the engine for 1mins. Turned car back on, and drove as normal without the high engine revving up. 01/02/2015 Temp 29F. After 12hour parking, time about 7:20am on local road and about 7:40am on highway: The same thing occurred one on the local road, and one on the highway. In these two times, I released the gas pedal, and re-applied the same pressure on the gas pedal, and there were no high engine revving up and the speed increased as normal. There are two engine noises as the car moving that I have noticed up to now: 1. Also a huge noise but more like an OMMMMMM. A huge OMMMM noise as the ICE kick in to the speed. This one seems to be normal although it always came on suddenly even without pressing the gas pedal further more, and the car speed does not drop and the car can go faster when pressing down the gas pedal. This OMMM noise has been happening since the date I got the car. It happens from time to time. One big OMMMM and then it blends down to regular operating engine noise. 2. The new high engine revving (like a screeching) noise as describing from the begining this post. This one is different from the number 1. There is no initial big OMMM, but it is as if the gas pedal pressing down to the metal until the gas pedal release. And the car speed drop, no acceleration. I could take the car to the dealership. They could probably find something wrong with it IF they can reproduce the problems. I doubt they can reproduce the problems without having the car at the dealership for days and days. I have no doubt if I described to them as to what described here, I would have the similar reactions and responds that I received when I described to them about the dead car from the 12V battery problems which should be widely known by now. Hopefully, this new engine high revving noise is one time thing like several others one-time occurrences with the CMAX Hybrid. Mileage: ~35,800 miles. At purchase, I was debating about the Hybrid or Energize. I was thinking that let's try out the base model, if all goes well/normal, I would upgrade to an Energize. May be it I got the Energize then, then there would be no issues. It is a good to great car in its class, but it is not normal to have these issues.