my son got an Aveo a few months ago and it a perty nice car for $10,000 it has a little get up and go, its not no V-6 or V-8 but its ok. not sure what his gas mileage is. No problems yet, but for $10,000 drive it till something major goes wrong trade it in for another. You cant expect to much for that price.
As for the Chevy Geo. I had the Sprint when it first came out, the best little car I ever had. I drove the sh** out of it and never had to replace anything not even the clutch and it was still running strong with over 150,000 miles on it when my wife was rearended and totaled it out. I was still getting about 50 miles to the gal. with it
Wade