We check this website, now fueleconomy.gov is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is fueleconomy Down Right Now? - NO! fueleconomy is up!
If you have problem with access to site fueleconomy, and domain fueleconomy.gov is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).