Toyota's Game-of-Life ads highlight the much-anticipated Prius c - a smaller, less expensive version of the Prius. "Be a winner with the all-new Prius c." Ford is promoting its new gas-saving Focus - the S-F-E version. "To save fuel, it makes itself more aerodynamic." Meanwhile, Honda is advertising its new Civic fuel-saver - the H-F. And Chevy is touting its Cruze Eco. How well can these four vehicles stretch your fuel dollars? Let's start with the Prius c. "In city driving the Prius c delivers an amazing 37 mpg, which is the highest of any car Consumer Reports has tested." But the Prius c is slow to accelerate. The ride is stiff and the cabin is noisy, too. As for the other cars, manufacturers made current models more fuel-efficient with modifications like low-rolling-resistance tires and aerodynamic add-ons. These vehicles are all promising 40 miles per gallon or better on the highway. Consumer Reports used this device to measure highway mileage. Tests show all three cars do get 40 miles per gallon or better as promised. Rik Paul, "We found an improvement of one to three mpg overall with these cars. But you pay 500 to 800 dollars extra for those fuel-saving options." Instead, consider the Mazda3 i Skyactiv, which rated higher in Consumer Reports' tests. ."