65 miles in perfect weather with a brand car and NO heater is certainly possible.
The basic range formula for 65mph is 4 miles/kWh economy multiplied by 21kWh of stored usable energy in the battery equals 84 miles of range.
Range only gets worse with:
1- Heater use (up to 30% reduction)
2- Battery degradation from normal use (and accelerated in hot areas, up to 30% reduction)
3- Battery losses from cold (10% loss at 30F, and 20% loss at -10F)
4- Driving in snow and standing water (affects your pickup truck also)
5- Going up hill, however slight the grade (affects your pickup truck also)
6- Driving into a head wind (affects your pickup truck also)
7- Driving with a heavy load (affects your pickup truck also)
So, at a minimum, assuming perfectly level dry roads in warm air, you will lose 10% of the battery capacity in the first year, and maybe 3% per year after that. It can be better or worse.
Why don't you tell us where you plan to operate this car from and to?