At last check, the official EPA website, fueleconomy.gov, has gathered estimates from 14 real-world C-Max Hybrid owners and five 2013 Fusion Hybrid owners. The C-Max owners report averaging 40.5 mpg; the Fusion Hybrid owners, just 37.1 mpg.
Again, your results may vary.
We've bought one of each of these cars, and our test drivers are busy putting break-in miles on them. We'll report results from our own real-world fuel economy tests as soon as we have them.
In the meantime, our anecdotal experience also isn't living up to Ford's 47 mpg claims. The trip computer in our C-Max has been wavering between about 33 mpg and 39 mpg. We've only had our Fusion Hybrid for two weeks, but one driver with a long commute says he saw about 40 mpg on its trip computer.
It's worth noting that at these high mileage levels, even a small increase in fuel consumption look like a big shortfall in mpg.
Earlier this month, the EPA forced Hyundai to restate fuel economy estimates for 23 models after overstating their estimates. The company is spending an estimated $100 million a year to refund customers who bought the cars for the extra fuel they burn.
Hyundai Chief Technology Officer W. C. Yang says the company is making "process corrections" in how it rates fuel economy. For the most part, automakers self-certify their vehicles' fuel economy, and then EPA tests about 15 percent of them in a lab to check the automakers' claims. With hundreds of millions of dollars on the line, automakers have every incentive to squeeze out the highest fuel economy estimates they can.