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Old 01-14-2008, 01:07 AM   #12 (permalink)
MetroMPG
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,376

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.07 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car - '14 Mitsubishi Mirage ES (base)
90 day: 50.04 mpg (US)
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I don't think peak hp is where it matters.

It takes approximately 6 hp to drive my car @ 40 mph on a level road. Regardless of whether that 6 hp is coming from a 3-pot capable of 49 max. hp or a V8 capable of 300, it still only needs to burn enough fuel to make 6 hp. So if you remove the hypothetical 1 hp burden of the charging system, you've just reduced power requirements by 1/6th for both motors.

The fuel savings of doing that won't scale exactly of course, due to the extra power required to overcome internal friction in the V8, and their different BSFC profiles & how they respond to changing load. But the effect definitely won't be proportional to the peak power of each mill.
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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
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