GeorgeS,
Enertia 3.1 gets about 20-25 miles @ 55-60 mph, I would guess Empulse 10.0 would get around 65-70 miles @ 65 mph. That's still well under your desired range and cushion, so yes you'll need to charge for some time at your destination - probably 2+ hours on 110v.
If you can find a backroads route for the commute, you might be able to do the entire thing without recharging in the middle - maybe 40-45 mph.
For purposes of calculating range / charge, it's probably sufficient to run one leg or portion of a leg of the trip. If it's like the Enertia, the dash should display windowed power draw and remaining energy capacity - see p18 in the
owner's manual (pdf). Figure out how much cushion you need to return back - the Empulse should charge about 800w off of a 110v outlet, or approx 6 miles/hour.