The Honda Insight is an amazing vehicle. I drive mainly on highways and country roads, and over 155,000 miles (my 3 cars combined) I have averaged 86 MPG. If you only need 2 seats and do lots of highway trips, this is the car for you! For maximum mpg I highly recommend the 5-spd, as the CVT does not have the lean burn catalyst (good for an extra 21 mpg)
I have never had a flat tire, battery problem, or any other problem. The ride is a little firm, with relatively high pressure in the tires. But ANYONE can achieve mpg in the 80's, if desired. Just set tires to maximum (rated on side of tire) and slow down a little, trying to hold a steady speed and keeping in lean burn mode.