How many KW should I be able to use from a full charge?

Under its five-cycle testing, the United States Environmental Protection Agency found the 2011 model Leaf's energy consumption to be 0.212 kWh/km (34 kWh/100 miles) and rated the Leaf combined fuel economy at 99 miles per gallon gasoline equivalent - MPGe - (2.4 L/100 km), with an equivalent 106 mpg-US (2.22 L/100 km; 127 mpg-imp) in city driving and 92 mpg-US (2.6 L/100 km; 110 mpg-imp) on highways.[55][56][72] For the 2013 model year Leaf, Nissan achieved a 15% improvement of its EPA's fuel economy combined ratings.[12] According to the EPA, the 2013 Leaf improved its energy consumption to 29 kWh/100 miles (0.18 kWh/km) down from 34 kWh/100 miles (0.21 kWh/km), allowing the Leaf to increase its combined rating to 115 MPGe (2.0 L/100 km), 129 MPGe (1.8 L/100 km) in city driving and 102 MPGe (2.3 L/100 km) on highways.[73] from wikipedia~ http://en.wikipedia.org/wiki/Nissan_Leaf#Battery