Hi Dan, with an 8 mile commute, the Sonata is barely getting warmed up before you get to work/home. It takes awhile for the engine and other drive train components to reach normal operating temperature, and the energy to warm up all that metal and rubber comes from gas. Reset your FCD and then go for a 30 - 40 mile drive with steady speeds on the 45-55 mph range if possible. I have seen 76 mpg after a fillup when the car was warmed up prior to the fill.
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