Hybrid models do have extra goodies that standard models don't have that can get better mileage... CVT transmissions, Atkinson cycle engines, etc. How any specific hybrid behaves at 70 depends a lot on which model it is. On my Escape hybrid, there's a huge difference in mileage between going 65 MPH and 70 MPH. Looking at the EPA ratings, I'd say go with the Fusion hybrid. It only gets 1 highway MPG less than the 4cyl manual 6 speed. Overall, you will probably get better mileage in the hybrid.
I would also suggest you look at the Hyundai Sonata Hybrid. It is rated a little higher for highway MPG than the Fusion is, and I've heard good things from the Sonata Hybrid owners.
__________________
|