Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Online tool: shows aerodynamic drag, rolling resistance, power required & est. MPG

MetroMPG · 12-09-2008, 09:11 AM

Thought of another flaw in the calculator: CRR entered is supposed to be for the tires' resistance, but rolling resistance involves some drivetrain resistance as well (bearings, possible brake drag, CV/U joints, differential).

Determining your actual Crr experimentally and entering it would be best. See:

http://ecomodder.com/forum/showthrea...stance-62.html

and/or http://ecomodder.com/forum/showthrea...mula-3737.html

12-09-2008, 09:11 AM	#2 (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	Thought of another flaw in the calculator: CRR entered is supposed to be for the tires' resistance, but rolling resistance involves some drivetrain resistance as well (bearings, possible brake drag, CV/U joints, differential). Determining your actual Crr experimentally and entering it would be best. See: http://ecomodder.com/forum/showthrea...stance-62.html and/or http://ecomodder.com/forum/showthrea...mula-3737.html __________________ 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