Congrats on the new car! My fiance has a Sonic 1.8L and I have its big brother- the Cruze 1.8L. I'm jealous though, wish I had the turbo like you. They're really well-built cars. As you probably know, they're the only compacts built in the USA.
We're both beating the EPA ratings pretty easily. I would recommend a grill block before a tune. It's basically free and it's guaranteed better mileage on the highway. GM says the lower grill block is good for +1 hwy mpg on the Cruze.
Here's a thread about that:
http://ecomodder.com/forum/showthrea...ead-29124.html
Just take it off before you drive through Death Valley in the summer
