No, I have the visor and the bug shield above the radiator as well as the factory lights. On a W9 the visor/shield are about .1mpg penalty at most so no biggie. It's on the trucks like a T600 where the shield is about .3mpg and then to the Sprinter where they are at least 1/2 mpg where it makes a significantly calculable difference.
Leo Bricker, owner trucks 3034, 4958
OOIDA 677319
73's K5LDB
Highway Watch Participant, Truckerbuddy
EO Forum Moderator 1+ Years of Service
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Support the entire Constitution, not just the parts you like.