I agree with elhigh on the air dam. Raising the front probably created even more turbulence under the truck than before. Anything you can do to smooth out the airflow will help. You may want to consider making a belly pan as well as an air dam.
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Almost all my driving is done 1-5 miles at a time.
Best short trip: 2.4 l/100 km, 3.9 km
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