I think the manual is referring to the range you'll get when driving - not charging. JibJab's logic is correct. If the figure shown at the end of a full charge is not impacted by external factors then it should match the EPA figure - that's what the manual says should happen. But as anyone who has charged a battery in the cold knows, you'll not get the maximum capacity from the battery. The manual could be clearer at expressing the external factors that limit the charging capacity.
Although if JibJab hasn't actually charged to 100% then we may find that the charging curve is not linear...
Although if JibJab hasn't actually charged to 100% then we may find that the charging curve is not linear...