Google is doing their own FE experiments
 

Complete details at their site...
https://www.google.org/recharge
https://www.google.org/recharge/experiment

A few charts:
https://chart.apis.google.com/chart?c...75|bg,s,ffffff
Electricity usage for plug-in vehicles: Ford Escape Plug-In 133.2 Wh/mi, Toyota Prius Plug-in 139.6 Wh/mi

https://chart.apis.google.com/chart?c...75|bg,s,ffffff
Electricity usage for plug-in vehicles: Ford Escape Plug-In 133.2 Wh/mi, Toyota Prius Plug-in 139.6 Wh/mi

https://chart.apis.google.com/chart?c...75|bg,s,ffffff
Electricity usage for plug-in vehicles: Ford Escape Plug-In 133.2 Wh/mi, Toyota Prius Plug-in 139.6 Wh/mi

https://chart.apis.google.com/chart?c...75|bg,s,ffffff
Electricity usage for plug-in vehicles: Ford Escape Plug-In 133.2 Wh/mi, Toyota Prius Plug-in 139.6 Wh/mi