Ford has announced official EPA mileage figures for its latest plug-in hybrid, the Fusion Energi.

Set to join the C-Max Energi in Ford's range, the new plug-in Fusion becomes America's most fuel-efficient sedan, with a rating of 108 MPGe in city driving.

That puts it 5 mpg ahead of the Toyota Prius Plug-In in city driving, and ahead of some pure electric cars too, like the 94 MPGe city-rated 60 kWh Tesla Model S.

Whether those figures will be enough to sway customers from the less expensive Chevy Volt is a different matter.

At $39,495 in SE trim, the Fusion Energi costs $350 more than the Volt, and doesn't benefit from the full $7,500 federal tax incentive either, increasing the pricing gap.

Of course, the Fusion may be the better choice for people who need that fifth seat, and should be more efficient in hybrid mode too.

Buyers will no doubt be keen to see whether Ford's economy claims live up to promise, too--as the company faces lawsuits over the gas mileage of the Fusion and C-Max hybrids.

+++++++++++

Follow GreenCarReports on Facebook and Twitter.