Think about it. What's the biggest pain about driving to work? Of course, there's the time involved. You could be doing something more productive--with your time. Not much choice on that one though. Another piece of P.I.T.A., having to stop and fill up once or twice a week...and pay!
To plug in? Would cost your company about as much as a slice (or half slice) of pizza or cup of coffee (not a fancy-something latte, from Starbucks, either) $3 a day for each plug could cover installation cost and the cost of electricity. How else could they put a smile on your face for such a pittance? What a bang for the buck perk!