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I also think it's mainly increased frontal surface area, which includes the front between the bumper and the ground. Best way to increase fuel economy would be to drive 55-60mph on cruise or lower the vehicle. Best way for the latter would be one of those JDM AHC controllers that allows one to drop/raise the front/rear independently of one another in 10mm increments. The new LX basically does this (drops the vehicle at highway speed by a fixed amount, the front drops more than the rear) to regain some lost mpg's due to the increased engine displacement.
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'03 LX470: ART slotted & cryo'd rotors, Porterfield R4s pads, Stoptech stainless hoses, ARB sahara & Kaymar bars, HID's.
'05 LS430 Ultra luxury edition: rear massage/heated&cooled seats, rear coolbox, side laminated glass w/ built-in window shades, suede headliner
'01 Prelude SH: bone stock
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