When Tesla unveiled itsSemi electric truck, it made audacious claims about thebig rig's value -- namely, that companies would recoup the cost of the vehicle in 2 years thanks to the savings on fuel. As it turns out, that might have been conservative. DHL exec Jim Monkmeyer told Reuters in an interview that he expects the shipping company to reach that point in a year and a half, saving tens of thousands of dollars per year. The absence of fuel is only part of the equation, he noted. As EV motors are much less complex than the big diesel engines that power conventional trucks, the Semi shouldn't need as much maintenance.