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Ford made three big mistakes in calculating MPG for 2013 C-Max Hybrid

It's been a rough time for the official fuel economy figures for the Ford C-Max Hybrid. When the car was released in 2012, Ford made a huge deal about how it would beat the Toyota Prius V, which was rated at 42 combined miles per gallon, 44 city and 40 highway. The Ford? 47 mpg across the board. How did Ford come to this place, where its Prius-beater turned into an also-ran? Well, after hearing customer complaints and issuing a software update in mid-2013, then discovering a real problem with the numbers last fall and then making a big announcement last week that the fuel economy ratings of six different 2013 and 2014 model year vehicles would need to be lowered, the C-Max Hybrid has ended up at 40 combined, 42 city and 37 highway. In other words, the Prius trumps it, as daily drivers of those two vehicles have known for a long time. The changes will not only affect the window sticker, but also the effect that the C-Max Hybrid (and the five other Ford vehicles that had their fuel economy figures lowered last week) have on Ford's compliance with greenhouse gas and CAFE rules for model year 2013 and 2014. How did Ford come to this place, where its Prius-beater turned into an also-ran? There are two technical answers to that question, which we've got below, as well as some context for how Ford's mistakes will play out in the bigger world of green vehicles. Let's start with Ford's second error, which is easy to do since we documented it in detail last year (the first, needing to do a software update, was also covered). The basic gist is that Ford used the general label rule (completely legally) to test the Fusion Hybrid and use those numbers to figure out how efficient the C-Max Hybrid is. That turned out to be a mistake, since the two vehicles are different enough that their numbers were not comparable, despite having the same engine, transmission and test weight, as the rules require. You can read more details here. Ford's Said Deep admitted that the TRLHP issue is completely separate from the general label error from last year. Now let's move on to last week's announcement. What's interesting is that the new recalculation of the MPG numbers – downward, of course – was caused by a completely separate issue, something called the Total Road Load Horsepower (TRLHP). Ford's Said Deep admitted to AutoblogGreen that the TRLHP issue had nothing to do with the general label error from last year.

EPA says fuel economy test for hybrids is accurate

The EPA says it stands behind its fuel economy test for hybrid vehicles following controversy about the testing process after Ford C-Max Hybrid customers and automotive journalists alike struggled to achieve 47 miles per gallon, the advertised mpg number, Automotive News reports. Ford responded to the issue almost two weeks ago by claiming that a 1970s-era EPA general label rule was responsible for the inaccurate mileage numbers, rerating the C-Max Hybrid's mpg numbers and offering customers rebates. Ford later said it didn't overstate the C-Max Hybrid's fuel economy and that it was surprised by the low numbers.
Ford technically didn't do anything wrong because it was following the general label rule, but agency regulator Christopher Grundler says the automaker was exploiting a loophole when it came up with the hybrid C-Max numbers, and that the testing process remains accurate. The general label rule allows vehicles that use the same engine and transmission and are in the same weight class to share fuel economy numbers, but it doesn't take into account other factors such as aerodynamic efficiency, which affects hybrids more drastically than non-hybrid vehicles. Ford originally used the Fusion Hybrid economy figures for the C-Max Hybrid and claimed the engineers didn't realize that its aerodynamic efficiency would affect fuel economy as much as it did.

Ford hit by lawsuit over hybrid technology from, surprise, Paice

The name Paice will be familiar to anyone who's been deep in the weeds of hybrid history, but it will probably be new to anyone who simply drives one. The key part of the story is something called "HyperDrive," which is the name given to a gas-electric powertrain technology developed by Alex Severinsky and patented in 1994. HyperDrive is a way to get the energy from both the electric battery and the engine into the wheels, seamlessly. The patents are held by Paice, which is an unusual company (its HQ is a house in a retirement community, right by a golf course) that does nothing but litigate. You can read more on Paice here. The latest case targets Ford and the hybrid and plug-in versions of the C-Max and Fusion models as well as the Lincoln MKZ. Paice claims that it held "over 100 meetings and interactions with Ford" between 1999 and 2004, and gave the automaker, "detailed information about the hybrid technology that Paice had developed." The suit also alleges that: For more than five years, Paice answered inquiries from multiple departments within Ford, believing in good faith that a business relationship between Paice and Ford would be mutually beneficial and advance the acceptance of Paice's technology. ... After years of Ford learning the details of Paice's hybrid drivetrain technology, Ford elected not to enter into a business relationship with Paice. The suit is officially known as, "Paice LLC v. The Ford Motor Co., 14-492, U.S. District Court for the District of Maryland (Baltimore)" and you can read the PDF here. Ford told AutoblogGreen, "we do not comment on pending litigation." Toyota settled a similar patent-infringement case in 2010 and now pays Paice almost $100 for every hybrid it sells. Paice is still in court against Hyundai and Kia. In 2010, Ford also settled with Paice but they agreed to keep negotiating on other issues until at least January 1, 2014. With that date now in the past, it didn't take long for Paice to file papers to get the two sides back before a judge. That's where it appears to be most comfortable.