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You should be able to use zip ties on a grill block too. Also, you might get away with screwing in an air dam, since it's underneath...ain't nobody gonna check there for little extra holes, and wouldn't know what they were if they did see them. I'd think your biggest factor will be the base vehicle...be careful, I once rented an Impala for the 31mpg thing....they gave me the Impala SS......25mpg.
Remember too, going 60mph giving yourself time to get there will put some money in your pocket rather than hammering to and fro at 75-80mph, that seems to be where a fair amount can be saved. But a challange for a bunch of younger guys, it is a definite mindset shift.
I don't think taping the seems would pay itself for the tape you'd have to use, this is an over rated aero enhancement.
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