OK, it is a sponsored article. Bet you can't guess who sponsored this ad, er, I mean... "article". If you said "Tesla", well, you were correct. Tesla, would tell you: "Just look at the EPA's own MPGe figures."
Anyhow, just keep in mind that this is a little slight of hand ad by Tesla, interesting, but still an ad.
Sponsored: Green Rides: Electric Vehicle Mileage Matters – The Mercury News