Pack it in, pack it out. This camper’s maxim can be embraced by Jeep when it comes to tailpipe emissions in the great outdoors. The 2021 Jeep Wrangler 4xe plug-in hybrid allows for 22 miles of all-electric range and the equivalent of 49 mpg, more than double the next most efficient Wrangler. The Wrangler “four by e” new for 2021...