CR's mileage measurement is worse than Car and Driver's. C and D uses a standard highway loop going 75 mph (and got 46 mpg while Volt got 37 mpg doing the same loop) so it should be worse than CR's, and yet it's better. Perhaps the difference is C and D had the battery charged and CR's didn't?
I would take with more than a few grains of salt any numbers reported from testing a plug-in EV by
Consumer Reports.
CR's first driving test of the Tesla Model S reported an EV range substantially lower than the EPA rating. It wasn't until quite a few paragraphs into the article, as I recall about mid-way down the 2nd page of a two-page article, where they stated that they only charged the car to 80% because that's what the manual recommended for daily charging!
Who would plan to drive a BEV a distance which would challenge its range, yet not charge it to maximum before leaving on such a trip? And even that aside, what really torqued me off about CR's highly misleading range rating was that they reported their lowballed range rating in the first sentence or two of the article, and (if I recall correctly) mentioned it again further down the first page, yet CR didn't report that they only charged the car to 80% until much further down in the article! And everyone knows that all but the shortest news articles are written with the expectation that many readers will quit reading before getting to the end.
If CR decided to limit the charge for whatever reason, didn't they have a responsibility to explicitly state that fact every place they mentioned the range that they got? Would it have been so hard to write "220 miles (with an 80% charge)" instead of just "220 miles"?
But wait, the story gets even worse: A few days later, I went back and tried to find the reference in the story to an 80% charge, but I found the article had disappeared behind a paywall (the full article was apparently offered for free online for just the first few days after publication), and in its place was a far shorter summary article. That summary mentioned the lowball range rating, but omitted any mention of the fact that CR charged the Model S to only 80%!
Anyway... because of those and other experiences I've had with how CR rates plug-in EVs: When it comes to the subject of this thread, I would certainly be far more inclined to believe a report from
Car and Driver. Who knows what strange or bizarre setup CR used to test the Clarity?
FWIW: It's not that I question CR's objectivity when it comes to rating plug-in EVs; it's that I question their competence and understanding of EVs.
"Never attribute to malice that which is adequately explained by stupidity." -- Hanlon's Razor