Ok, after 2 tanks I can say there is definetly no loss on mpg using the drop-in. In fact, I'd say it is very possible to see some gains in mpg's. The throtle response is better and the car is breathing better. And yes, it is more silent with the drop-in than when with the stock filter.
White Platinum Metallic Tri-Coat
303A, 6-Speed SelectShift Automatic, 17" Aluminum wheels, Luxury Package,
Parking Technology, Navigation, Winter Package
Chevy Volt 2014, White Diamond, Luxury Package, S1, Navigation.