The biggest problem the OP has is he is expecting to get at or near the manufacturers quoted consumption figures.
The quoted consumption figures for hwy city or combined are how the vehicle performed in a standardised test that has nothing to do with real world driving.
The tests are standardised to enable the consumer to compare apples with apples when researching the fuel usage of a prospective vehicle.
They in no way indicate that the vehicle should achieve said figures in real world driving and it (any vehicle) probably wont unless you drive slow enough to get shit thrown out the window at you.
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