You also use Imperial Gallons, which are bigger than US Gallons. Every European car also sold in the US gets better mileage on just that fact.
Electric vehicles are great, I've driven a Volt and loved it. But like gas vehicles once were, Electric vehicles are still too new to be a real "value." It's why I bought a gas Focus.
Remember that once upon a time gas powered vehicles were ridiculously expensive, unreliable and no one wanted one compared to a horse. And really, gas and diesel vehicles didn't get over that hump until the 1950s. By the early 1920's here in the states most people in cities had at least 1 car, but rural areas didn't see everyone owning a cars until the late 1940s at least. My grandmother saw her first car during the Depression in western Kansas, the family didn't have one until 1943.
And back to the 50s, it wasn't until then that two cars in every garage was a reality in the States, unless you had been wealthy.
Electric vehicles don't have all the humps gas and diesel did to overcome. There are paved roads just about everywhere (or at least, passable roads). The only problems to overcome are as follows: an updated electric infrastructure, at least in the US, to handle every house having an extra 240 volt socket to charge the things as well as fast charging 340 volt units at gas stations and businesses, AND lighter weight batteries.
As far as the Focus goes, I think its like the Volt where people just don't understand the technology and/or don't think it can provide a value to them. In the Volt's case, unless your round trip is less than 40 miles a day for a decade it probably won't be a value either. But Ford, Chevy, Toyota, all of them need these vehicles in the wild to get real world data on their use and any problems they could have.