Ford's restatement of fuel-economy figures for the C-Max caps a series of efforts in recent years to sort out discrepancies between EPA ratings and real-world vehicle fuel economy.
December 2006: The EPA expands its fuel economy test from two cycles to five for the 2008 model year. One goal was to reflect hybrids' performance more accurately by factoring in air conditioning use, cold weather and acceleration at high speeds.
October 2007: Fuel economy labels show lower mpg numbers for hybrids as the five-cycle test goes into effect. The Toyota Prius, rated at 51 mpg highway and 60 mpg city for the 2007 model year 2007, gets a rating of 45 mpg highway, 48 mpg city for the 2008 model year.