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MetroMPG · 03-04-2009, 10:28 PM

The transmissions came with the same gear ratios, but different final drive ratios. You could install a transmission with a taller final, which would lower your RPM in all gears for a given road speed. = slower acceleration, potentially slightly more clutch wear, and better fuel economy.

Project 'nerd gear': taller tranny transplant nets +5.2% MPG - MetroMPG.com

03-04-2009, 10:28 PM	#2 (permalink)
MetroMPG Batman Junior Join Date: Nov 2007 Location: 1000 Islands, Ontario, Canada Posts: 22,527 Blackfly - '98 Geo Metro Team Metro Last 3: 70.09 mpg (US) MPGiata - '90 Mazda Miata 90 day: 54.46 mpg (US) Even Fancier Metro - '14 Mitsubishi Mirage top spec 90 day: 70.75 mpg (US) Appliance car Mirage - '14 Mitsubishi Mirage ES (base) 90 day: 62.14 mpg (US) Thanks: 4,078 Thanked 6,976 Times in 3,612 Posts	The transmissions came with the same gear ratios, but different final drive ratios. You could install a transmission with a taller final, which would lower your RPM in all gears for a given road speed. = slower acceleration, potentially slightly more clutch wear, and better fuel economy. Project 'nerd gear': taller tranny transplant nets +5.2% MPG - MetroMPG.com __________________ 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