Cross-country is going to be all about rider endurance, aero, efficiency, and charging speed..
The stock ZF11.4 is rated for 85 miles @ 55 mph. It has two charging options:
120/230V AC: 7.4 hours 95% = 10.9 miles/hour. Charge 4.6h, ride 1 = 9.8 mph ave
480V DC CHAdeMO: 1 hour 95% = 81 miles/hour Charge 1h, ride 1.6 = 34 mph ave
Stock, the Empulse probably does around 70 miles @ 55 mph. It has two charging options:
120V AC: 8 hours 99% = 8.8 miles/hour. Charge 6h, ride 1 = 7.9 mph ave
230V AC: 3.5 hours 99% = 20 miles/hour. Charge 2.5h, ride 1 = 15.7 mph ave
With better aero, Zero's range could be improved..
Say 45 mph, 130 miles. Charge 1h, ride 2.9 = 33.5 mph ave
Say 55 mph, 110 miles. Charge 1h, ride 2.0 = 36.7 mph ave
Say 70 mph, 95 miles. Charge 1h, ride 1.36 = 40.3 mph ave..
When you start to charge more quickly, your travel speed actually goes up by riding at higher speeds.. even if the bike is less efficient at those speeds.