For 24,000 miles or two years
For 24,000 miles or two years Chevy provides free tire rotation and oil changes on all 2014 Volts... I see the cost of maintenance as a non-issue on a Volt.... After 24,000 miles, the cost of an oil change is minimal.... And in fact most dealers in our area provide free oil changes anyways...
Also the Volt EPA range is 38, not 35.... So the round trio tether range on a Volt is about 19 miles (Out and back).... The I3, with range extender, is about 35 miles.... I can not image that the 600cc engine will provide enough energy to keep the I3 up to highway speeds when climbing a hill.... So if 100 % of your driving is within 35 miles of home go with the I3.... If you plan to use your EV on occasional 100 mile trips go with the VOLT....That's my take