Quote:
Originally Posted by oz555
I seriously doubt that benefit is significant. Someone should make real world test to prove that. New cars have different cooling system than the old cars. Second closed grill looks too cheap for one BMW.
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It's a case of "every little helps". Reducing emissions, even if it may be as little as 3 g/km per vehicle, adds up across the fleet fitted with active shutters. One comment I've read, suggests that the CO2 saving in 2018, from vehicles fitted with active shutters was something like 25,000 tonnes.
There are tests, studies and papers, giving the data on reduction in aerodynamic drag, warmup benefits, etc. It is why active shutters are coming to most ICE vehicles.