Range getting worse and worse

After my morning commute today of only 18 miles in traffic and an average speed of 37mph, my leaf only had less than 55 miles left after arriving. This was driving at 4.3 miles/kwh efficiency and ac off. If driving normally and with ac the estimated range drops to a little over 40 miles thus giving a total range of 58 miles, very off from nissan's 100 miles claim and the magazine's test of 80 miles.