I've driven my 2011 Corolla for 18k/mi and wish I would have been less concerned about MPG than comfort.
The car feels a bit underpowered. It also needed a front tire replacement almost immediately because it was defective (two dealer visits).
MPG is good but I'm not sure that the gas savings are worth the back pain.
I'm glad I didn't get rid of my 2004 Sienna because I absolutely cannot drive the Corolla all the time.
Should have gotten a Camry instead which has more comfortable seats and fits a taller person better (I'm over 6').
Large trunk, satelite radio, bluetooth, good AC
Smoother transmission, better seats, better handling.