I wouldn't buy the 4xe if your primary concern is long-range driving. We're getting 26 miles / 42 km per charge in the summer, down to about 22 mi / 35 km in the winter since we run the heated seats, wheel, and cabin heat.
Total range according to the dash computer is ~300 miles / 482 km. Jeep advertises 370 mi (595km), we were hoping for more range as it broke in but it's been pretty steady at 300. Our gas MPG is ~20-22 after we deplete the battery and depending on the driving we're doing (often at 75-80 mph on the highway). I haven't done a long trip and kept track manually so I'm only relying on what the computer estimates. It has a 17.2 gallon fuel tank (78L) so @ 20 mi/gal it should be able to do 340 miles on a full tank of fuel in addition to the electric miles.
You'll probably get better range out of a non-rubicon spec 4xe with street tires, also probably better range out of a non-electric wrangler with the 2.0L engine and a 22.5 gal fuel tank. Max range is likely achieved with a diesel wrangler.