Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Windows down on VW Golf = 2.5% FE reduction

MetroMPG · 11-28-2007, 09:43 AM

I thought 2.5% was realistic based the size of an open front window compared to the size of an open wheel well. Covering my rear wheel wells improved my FE about 2.8%. "Uncovering" the GTI windows reduced its efficiency by 2.5%.

I realize they're not the same things (one doesn't have a spinning wheel inside it, further stirring up the air). But it's in the ballpark.

11-28-2007, 09:43 AM	#3 (permalink)
MetroMPG Batman Junior Join Date: Nov 2007 Location: 1000 Islands, Ontario, Canada Posts: 22,534 Blackfly - '98 Geo Metro Team Metro Last 3: 70.09 mpg (US) MPGiata - '90 Mazda Miata 90 day: 54.46 mpg (US) Appliance car Mirage - '14 Mitsubishi Mirage ES (base) 90 day: 57.73 mpg (US) Thanks: 4,082 Thanked 6,979 Times in 3,614 Posts	I thought 2.5% was realistic based the size of an open front window compared to the size of an open wheel well. Covering my rear wheel wells improved my FE about 2.8%. "Uncovering" the GTI windows reduced its efficiency by 2.5%. I realize they're not the same things (one doesn't have a spinning wheel inside it, further stirring up the air). But it's in the ballpark. __________________ Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata Honda mods: Ecomodding my $800 Honda Fit 5-speed beater Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage. Ecodriving test: Manual vs. automatic transmission MPG showdown EcoModder has launched a forum for the efficient new Mitsubishi Mirage www.MetroMPG.com - fuel efficiency info for Geo Metro owners www.ForkenSwift.com - electric car conversion on a beer budget