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PaleMelanesian · 05-21-2008, 10:29 AM

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.

05-21-2008, 10:29 AM	#17 (permalink)
PaleMelanesian Hypermiler Join Date: Dec 2007 Location: Texas Posts: 2,321 PaleCivic (retired) - '96 Honda Civic DX Sedan 90 day: 69.2 mpg (US) PaleFit - '09 Honda Fit Sport Team Honda Wagons 90 day: 44.06 mpg (US) Thanks: 611 Thanked 434 Times in 284 Posts	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. __________________ 11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles Last edited by PaleMelanesian; 05-21-2008 at 10:42 AM..