It was around April of 2011 when I noticed an ad in the Toronto subway for the 2012 Ford Focus, touting fuel economy of 59 MPG. I dwelled on that outrageous figure for a second, made a mental note to check if they were using Imperial MPG measurements and then promptly fell asleep on the train home and missed my stop. A Google search for the Ford Focus mpg claims didn’t yield anything from the Blue Oval, but did reveal a Google ad showing Mazda touting the same figures for its 2012 Mazda3 SkyACTIV, rated for 40 mpg on the highway. Even so, this would only be 48 mpg Imperial. So what gives? 10 mpg is not an insignificant difference.