Would you consider a hybrid vehicle?
They cost 25%-33% more, they add a lot of weight and complicity, and not even Toyota can figure out how to make them reliable. They are currently getting sued in Canada by RAV4 hybrid owners because a high power line which runs through the car keeps corroding, it costs $7000 to replace them, and Toyota claims it isn't part of your drive train so it isn't covered under the 10 year drive train warrenty.