I just knew that this was coming some day soon. The Ford Fusion has been named the United States’ most fuel-efficient mid-sized sedan. And yes, this is for both the hybrid Ford Fusion and the conventional gasoline Ford Fusion models.

The four-cylinder Ford Fusion S is now certified at 34 mpg highway and 23 mpg in the city, topping the Toyota Camry and Honda Accord. And what’s even more surprising is that the entry-level 2010 Ford Fusion S is powered by a new 2.5-liter Duratec mated to a fuel-efficient six-speed automatic transmission. I didn’t expect it have a six speed automatic.

The Ford Fusion I-4 now joins the all-new Ford Fusion Hybrid, which has been at the top of the mpg tables for some period of time now.

Ford has announced that the new four-cylinder Ford Fusion S has been certified by the U.S. Environmental Protection Agency at 34 mpg on the highway and 23 mpg in the city — beating both the gasoline-powered Camry and Honda Accord models. The news follows certification of the Ford Fusion Hybrid at 41 mpg rating in the city and 36 mpg on the highway, topping the Toyota Camry hybrid by 8 mpg in the city and 2 mpg on the highway.

The 2010 Ford Fusion fuel economy certification was conducted at Ford’s testing laboratories in Allen Park, Michigan. The Ford Fusion S and the base-level Mercury Milan, both powered by a new 2.5-liter Duratec 4-cylinder engine mated to a fuel efficient six-speed automatic transmission, will carry an EPA label of 34 mpg for highway driving and 23 mpg in the city when they go on sale this spring.

Ford has recently announced pricing for the new 2010 Fusion. The fuel-economy leading Fusion S with the six-speed automatic transmission features a base price of $20,870, plus destination and delivery charges.

Fusion also offers more engine choice than Camry and Accord, with two V-6 engine options — the 240-horsepower 3.0-liter flex-fuel V-6 and the 263-horsepower 3.5-liter Duratec V-6 engine. The 3.0-liter V-6 models start at $23,760.

The base price of the all-new Ford Fusion Hybrid is $27,270.

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