Americans are addicted to features, lifestyle and luxury (actual or perceived).
It takes mere minutes to refill a tank, and there are gas stations everywhere throughout the country. It's quick, and incredibly easy. Far faster than EVs, and far more common that EV charging stations.
As a result, there's really no value in tanks that are that much larger, there's no range anxiety because even going long distance cross-country you're never that far away from a place to refuel.
I'm comfortable doing long distances in one day and even I would be taking 20+ minute breaks every 300km (200mi) or so. The current state-of-the-art long range EVs are plenty good enough with range and charging speeds, assuming a reliable charging network.
I expect dragging around 120 lbs extra fuel for 100k miles does become noticable on the bank book, you'd be surprised.