The Tesla Model S is currently the highest-rated electric car on range, at a whipping 335 miles. It's little brother, the Model 3, isn't far behind, with it's Long Range version pegged at 310 miles. Those figures put it on par with a traditional gasoline vehicle. But, like gasoline vehicles, those numbers are calculated under certain conditions. What happens when you throw some obstacles in the way, like a 6,000-foot climb up a mountain pass?