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Yes. that lip is for aerodynamics. I think I read somewhere that it reduces the .cd by about .01.
Especially with an engine that big, keeping the rpm low is best for mileage. Hard to do with the gearing, though. Try Pulse & Glide. It works for me, even on the highway.
Also, for highway driving, smoothing over the upper grille will help your aerodynamics more then closing the lower one. Ideally, it would be smooth and flush. Not much air goes in there, anyway. Most of the cooling air goes in the lower opening.
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- - - - -Best 11-mile commute: 105 mpg
- - - - -Best tank: 88.5 mpg / 1133 miles
Last edited by PaleMelanesian; 05-21-2008 at 09:42 AM..
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