The 2009 Chevrolet TrailBlazer, which was the last model made, has an optimum fuel economy of 12 to 14 miles per gallon in the city and 16 to 20 miles per gallon on the highway. The exact number depends on the trim of the vehicle.
There are four different trims available on the 2009 Chevrolet Trailblazer. The base model, the LT, has the best fuel economy and comes with a number of standard features, including cruise control, satellite radio, OnStar and a CD player. The top trim level, the SS, gets the lowest fuel economy but features standard options such as a V8 engine, quick steering, heavy-duty brakes, and special exterior and interior looks.