I did two 65mph cruise control tests of 300 miles (same direction same road) and got 5.72mpg better on the grill block run. Even with a margin of error for wind there is still a significant improvement, that was with fog lamp covers and lower grill block.
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2007 Honda Civic Ex
Second Goal = 50mpg
First goal = 40mpg Goal Achieved 3 tank average over 40mpg
Starting point 30mpg ready...... GO.
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