Kerbe, I will counter your theoretical calculations with real world experience. I’ve monitored my mpg on four long trips of 750-1500 miles. All of it on interstate 15 driving between LA and southern and northern Utah at 70-80 mph, 2-3 adults with luggage. I consistently see 39 mpg. Driving in the empty desert means that gas stations are not on every off ramp. In all of those trips I haven’t been comfortable driving all the way from LA to Las Vegas, which is about 270 miles from my house without stopping for gas. My state of charge and gas levels were just too low for me to chance getting stranded. A car that won’t get me to LV without anxiety over running out of gas is missing a pretty low bar for what I want and expect in a long distance cruiser. My clarity is a fabulous commuter car but not one I would choose for regular extended driving in the western US. Obviously this is just my anecdotal experience, but for me it disproves your theoretical conclusions.