The Fast Lane Car headed into the "high country" in Colorado on the look out for what was new with GM's new high altitude/winter weather prototype testing fleet and came away with some pretty swell footage.

While heavy camouflaged, TFL chases what can probably only be Cadillac's new larger, CT6 luxury sedan; a vehicle that has recently confirmed to also come with a plug-in option.

Details are very scarce on the plug-in CT6, but we do know via GM execs that it will have a blended MPGe of about 70 MPGe and it will be available as a 2016 model in the fall of 2015.

Also keep an eye open at the start of the video for what looks to be the upcoming 2nd generation of Volt - in mule form anyway.

TFLCar, hat tip to offib!