"But the EPA says... " That's why. That's all they got to go on. Just like the EPA says the Model S is 265 watt-hours per mile, and the Volt 360. But each owners' group know the EPA figures are a lie. And not in the same direction.So the volt beats the Prius on this trip and blows away the Prius on a normal city commute. So why are people still buying priuses (prii?). Alas for a trip like yours, instead of taking 2 economy cars, I would have taken my Suburban. Screw fuel economy, I'm going for comfort and space for the kids and cargo - one driver vs. two - family bonding time in the vehicle.