Did a test loop while visiting my daughter in college. Drive time temps were 3°C to 12°C. It was 155 miles each way. This was prompted by an article saying the I-Pace with one skinny guy in it, on 20" tires, at 75mph on level ground at 8°C, could go a maximum of 169 miles. He based it on a 54 miles test with a 'very experienced' EV driver.
Departure: Car was preconditioned and 100%, it was 3°C at departure. Melted ice off while plugged in. Slightly under 75 mph average, but ACC was set at 75mph and I passed as necessary to keep up the speed and used HOV and tollroads as required by traffic. Arrived with 31% indicated SoC, after just a bit over 1hr (early lunch and shopping) at a "50kW" CCS by EVConnect. PITA, but man, does that I-Pace draw a crowd in a hurry!
This would net 224 miles, however there are winds and 800' of lost elevation, and the car is preconditioned fully.
Return: Left with 98% and no pre-conditioning. Melted ice with windshield heater. Averaged 77 mph. Average temp was colder. It never hit 50°F, mostly 38-43°F. Left while still dark. Arrived with only 15% left. 182 miles uncorrected range assuming normal 98% departure. Why not correct it? This is a more common situation when not at home. You charged the night before, drove to the hotel, and just hopped in the car when you were ready to leave, not on a scheduled departure. In my case, we watched a play with my daughter and had dinner, and topped it off to 100% at the campus.
Some of this difference is because I'm used to stretching range on California freeways, dating back to my motorcycle days in the 70's. And I have 6 years of experience making Chevrolet Volts go further than the EPA claims on the freeway without wasting my time or arriving late at the customer site. A customer we have had for 25 years, happens to be 58.4 miles round trip. Volts have 49 mile EPA Highway rating. I make it every time with room to spare, and have gone about 68 miles using the charge left over from one of these trips. Either I always get a Wednesday Car (best quality), or I have very trained foot.
Cliff Notes: Mild winter 310 mile round trip shows 201 miles of range at 75 mph.