I too had electrical problems in the first week. Turn key - nothing happened - dead. Luckily at the dealership when this happened. Turned out to be poor quality connections. After 4000 miles, overall 23.1 MPG, true suburban city, below 20, which sucks.

Are you recording your mileage here? Would be useful - mine is under OurGL. Tank notes for every fill. I'm finding this really ought to be rated 20/28.

27/32 is a crock.