Update
2010 3 hatch GT, 2.5L engine (auto).
Last two fill ups: 418 miles/ave speed 50, 32 mpg (calculated, computer said 30.0 mpg) Second, 415 miles/ave speed 52, 30.8 mpg (calculated, computer said 30.6 mpg). Computer was more accurate in the most recent fill up. Have two 38 mile trips a...