That's my personal... to get the 260 mile advertised range on 75 kWh battery, it would have to average 3.47 mi / kWh. I sometimes get over 4... but I also often get under 3 (especially in winter, when 2.5 is common.) Highway at those speeds in the summer (with AC) is ~3 or so which gives you ~225 effective road trip range between fill-ups.