BYD seems to be making serial hybrid cars with a direct to ICE coupled top gears.
That means the ICE runs at it's most efficient rpm most of the time, except when cruising where the losses involved in changing ICE rotational motion into electricity then back into rotational motion is less efficient.
They also do about all the things mentioned here like grille blocks and replacing the 12 volt lead acid battery with lithium to make cars capable of "2.9 liters per 100 kilometers on a depleted battery."
Amongst the tricks used to create such an efficient ICE is a compression ratio of 16 to 1.
"cooling experiments" were involved in getting the compression ratio that high.
Cooling experiments? They do talk about high efficiency heat pumps coming as standard.
Could they be using these to cool intake charge and still come out ahead?
I wouldn't be surprised to find Somender Singh 'unicorn' grooves in the head as well.
Here's the link to ignore
https://kr-asia.com/whats-the-secret...-hybrid-system