Quote Originally Posted by Daox View Post
GM hasn't "formally" announced what the next gen Aveo/Sonic fuel consumption numbers will be.

But in a YouTube presentation of the Sonic 1.4 turbo hatchback, Margaret Brooks, GM Small Car Marketing Director, says it'll be good for 40 mpg (US).

We'll presume that's the highway rating, though she doesn't say so.
It's probably safe to assume that it is with a manual transmission and that it is the highway rating. As for what the city rating is, "you don't want to know".

Considering that my '09 Aveo gets 37 hwy with A/T and the A/C on, that's no big improvement. But soon as you are no longer driving at highway speeds the MPG becomes dismally disappointing.

Of course they can always invoke the ultimate, all purpose disclaimer: "Your mileage may vary".