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MetroMPG · 08-06-2012, 12:36 PM

FYI, switching the alternator back ON after running the battery down may well negate any fuel savings (depending on how far you're going).

Why? Because now the higher alternator load is using extra gasoline to re-charge the battery (replacing the energy you "saved" by not running the alternator earlier).

08-06-2012, 12:36 PM	#7 (permalink)
MetroMPG Batman Junior Join Date: Nov 2007 Location: 1000 Islands, Ontario, Canada Posts: 22,532 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: 4,082 Thanked 6,978 Times in 3,613 Posts	FYI, switching the alternator back ON after running the battery down may well negate any fuel savings (depending on how far you're going). Why? Because now the higher alternator load is using extra gasoline to re-charge the battery (replacing the energy you "saved" by not running the alternator earlier). __________________ 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