I've found my Aveo doesn't get what was posted on my sticker. It said 30 mpg city, 35 mpg highway, fueleconomy.gov has a more realistic EPA listing, with about 26 mpg city, 30 mpg highway. I'm getting 30mpg city, 33mpg on a good highway trip, with one more mpg added to those in the summer. (But I think all that has improved since I removed the seats. We'll see!)
I've noticed my car shifting late also, just like yours, but I wasn't car-wise enough to realize this during the years my car was under warranty
Y'all know how much it might be for them to replace the accelerator pedal assembly? Thymeclock, did you see an overall gain in mpg?
Do you think using the "hold" button would make a difference? I haven't had a chance to play with it, but I don't *think* it would really help with this particular problem, since it seems that you have to have already shifted up to a certain gear to "hold" it there.
What totally bites about all this is that mine is a 2004, and if yours is a 2009, it's like Chevy totally ignored this issue! Surely they were/are aware???? Surely it would've been a quick fix in the assembly process? =/