gavincd 
2007 Nissan Sentra Sedan 2.0 S 4dr Sedan (2.0L 4cyl CVT)
It's an OK car
 I bought new in April, 2007 and drove it every day until it was totaled in a near head-on crash in October 2008.  Safety-wise it was great - lots of exterior damage but passenger and I remained very safe considering.  Over the 18+ months and 38,000 miles of ownership it averaged 29.34 mpg. (I drive careful - about 80% highway and 20% city.)  It was mechanically sound and dependable.  My biggest complaint was that it's gas mileage was oversold at time of purchase. We were told it would average 33-34 mpg with our type of driving.  While our mileage was OK, it fell short of promises. I'm not sure if I will buy another, but I have to consider it when weighing the known- proven crash safety, etc.