That's the kind of apples to apples comparison I want to see when someone talks about fuel economy; same driver, same commute. You have written before you were getting 30-32mpg with the Aveo and now 44-46 with the Cruze. Those numbers match up perfectly with the $20 vs $14 fillups. I may take a look at the Cruze...I drive about 30k a year and 80+% of it is interstate highway.
The cruze is capable of VERY good (64mpg good) fuel economy if you're willing to have a VERY light foot:
http://media.gm.com/content/media/us/en/chevrolet/news.detail.html/content/Pages/news/us/en/2011/Aug/0826_cruzeeco
http://www.shell.us/home/content/usa...iving/taylors/