Ford has been shooting salvos at Toyota with direct comparisons of vehicles like C-Max versus Prius. The EPA’s official assessment of the Ford C-Max Energi, the plug-in version of the new C-Max, is that it gets 108 miles per gallon in city driving and 100 in the highway and combined measurements. That’s 5 mpg better than the smaller Toyota Prius Plug-in, a version of the original member of the new Prius “family.” But will potential buyers care? So far, Ford has had only modest success in the battery-electric market. While Toyota currently produces about half of all battery-based models sold in the U.S., Ford’s market share has slipped by more than half over the last year to barely 4%.