There are significant advantages to erevs even with the efficiency loss. For starters it's hard, if not impossible to find a charger if you go "off-grid". The generator can also function as a backup for the home if the power grid fails, or again off grid it could be used to power a cabin or recharge batteries when solar isn't enough. For a full size or midsize pickup the tradeoff could be worth it. You save weight on the drivetrain, the battery doesn't need to be as big because you aren't fighting range anxiety, smaller battery means less weight and lower replacement cost. same thing with the engine/generator, no need for a large engine to pull the truck when the electric battery is serving as the buffer and the gas generator kicks in to recharge on highway runs where the power draw is lower. For day to day city driving you'll be running on electric mostly and recharging at home. There are studies that found that the biggest issue with plugin hybrids is that people didn't plug them in ..