Some numbers for you:
Distance, about 60 miles, depending on where in the Denver area you start, and the elevation gain is about 5600 feet.
Using Tony Williams' venerable Range Chart
, the energy consumption at 65 mph would be about 3.6 miles/kWh at 70ºF. The energy consumption for the elevation gain would be about 1.5 kWh/1000 feet. So:
60 miles ÷ 3.6 mile/kWh = 16.7 kWh
5600 feet ÷ 1.5 kWh/1000 feet = 8.4 kWh
Total = 16.7 kWh + 8.4 kWh = 25.1 kWh
1) If temperatures are lower than 70º, as is very likely at higher elevation, the energy use will increase.
2) If speeds higher than 65 mph are used the energy use will increase; conversely, slowing down will reduce energy consumption significantly for several reasons. The speed limit is higher than 65 over much of that route so if you drive the limit you won't make it without a lot of extra charge on the way.
3) If a headwind is encountered energy use will increase drastically. Been there, done that.
4) Tires will have less rolling resistance if the pressure is at least 40 PSI; Nissan's recommended 36 PSI is too low
for best efficiency. (But tire pressure increases with elevation, and vice versa, something those of us who drive mountains all the time need to keep in mind, so don't put the pressure up at 50 or something like that.)
Can you make it? Perhaps, in warm weather, driving gently and fairly slowly, despite traffic going much faster. I wouldn't think it would be much fun without a good long charge stop in Idaho Springs. If you could start with a full charge in Golden and then take US-6 until it merges with the freeway, it might make the trip easier.