Video: prototype Ford F-150 plug-in hybrid - 41 mpg
 

According to ABG, the claim is 41 mpg over the first 30 miles, presumably while the vehicle is in "charge depletion" mode - ie. using up the energy from the grid. It's not clear if the mpg calculation includes electrical energy consumption.

- up to 15 miles EV mode range

- up to 41 mpg mixed speed driving for the first 30 miles/day

- up to 21 mpg in hybrid mode after the 30 mile all electric range

YouTube - HEVT's Plug-in Hybrid Electric Ford F150 Pickup

Aside from the motor hanging down low behind the diff (watch those parking berms!), the biggest drawback of course is the price. $60k per conversion (you supply the truck).

The idea is pretty simple, now it seems like the electric motor is on a 1 to 1 ratio with the differential via drive shaft. Is that possible? or do you think there is gear reduction going on between the motor and the input shaft that connects to the pumpkin?

I'm sure utilizing current military style axles the same thing can be done with the electric motor tucked away in the bed instead of so close to the rear bumper. None the less Kudos for the effort and I hope they become a bit more affordable.

It's hard to say what they did with the diff gearing, but it's entirely possible to drive a RWD vehicle with a stock ratio given the right voltage/controller.