Originally Posted by Jffeijao
It makes no sense to cover the grill.
From an engineering perspective, application is designed and tested at minus 40C/F
Cabin, coolant, engine oil, transmission oil and fuel temperatures are eletronically managed and include back up heaters to bring them to ( and keep at) operating or set up temps.
I will agree that they are designed for the temperature, but I can tell you just driving around town in both vehicles that the gas one is doing much better in the heating of the cabin department.
On the highway I would probably not think of adding a cover, but my driving is essentially city traffic and shorter distances and -40 is as nasty as the number implies.