Q: i have a 2007 jeep comander with a 5.7 L, HEMI in it and when i bought it the dealer had told me that a hemi allows the car when traveling at a constant speed that goes from being a V8 to being a 4 cylinder or a V6 depending on the power u need, is this true cuz i did 300 km and i had to put 35 L to fill it back up to a full tank (and yes it was a full tank before the 300 km)
A: It only works at speeds below 65,this has nothing to do with it being a HEMI.The HEMI refers to the heads and has nothing to do with the cylinder deactivation system.