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Old 08-20-2009, 10:26 AM   #38 (permalink)
Deezler
Master EcoModder
 
Join Date: Apr 2008
Location: Michigan
Posts: 261

Bio Deezler (sold) - '03 Volkswagen Jetta GLS TDI
90 day: 50.78 mpg (US)

The Beast. - '03 GMC Sierra 2500HD SLT
90 day: 12.86 mpg (US)
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Thanked 36 Times in 22 Posts
Yes, I actually have noticed some good benefit to vehicle stability with the aero mods I've done, especially the diffuser. I try not to drink from the placebo kool-aid, but this is more tangible.

I know its frowned upon to discuss on a fuel saving website, but I can discern the most benefit at high speeds (80mph +). At 100mph, the stock aero made the car quite light and a little scary. Now its butter smooth (and gets there noticeably faster!). Susceptibility to cross winds, semi blow-by and other disturbing aero effects are also reduced.

Couple more aero-mods coming, then I plan to do a few coast-down tests. Unfortunately I don't have a baseline, but the Cd is pretty well known for my vehicle.
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