http://www.pushhogg.com/energy-saving-ovens/

help with over the range microwave?
I plane to buy a over the range microwave for a good deal but still i have to be smart and get information. My boyfriend just moved and his priority is to save energy bill.PLEASE HELP.
It is a Goldstar 1.5 Cubic Foot Over-The-Range Microwave or either theLG LMV1680ST 1.6 cu. ft. Over-the-Range Microwave Oven tell me if it is a good one.
1-what voltage should a microwave have to save energy?
2- how to install a over the range microwave?
3-Can I install it anywere or it have to be over the oven?
4-can i use a over the range microwave as a counter microwave?
5-Can you suggest any countertop microwave for a good price and that help save energy?
any where you install it has to be on its own circuit
CARE:Energy-saving stove in Chad/Energiesparende Öfen Tschad