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Old 02-15-2009, 07:38 PM   #1 (permalink)
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Location: 1000 Islands, Ontario, Canada
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Blackfly - '98 Geo Metro
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Last 3: 70.09 mpg (US)

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90 day: 55.97 mpg (US)

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

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Retro aeromods: Datsun 240Z factory bolt-on "G-nose" good for +5.5% mpg and +5 mph

Base / stock Z-car nose vs. "G-nose" version:

Car & Driver, May 1974:

Datsun, at least in Japan, has some equally impressive parts that it doesn’t widely advertise. Fortunately, car enthusiasts in the homeland can buy a version of the Z-car known as the 240ZG (260ZG for 1974).


From an aerodynamic point of view, the G-nose is a gold mine. It includes all the parts necessary to reshape the Z-car’s front end from the lower edge of the hood forward. The new panels bolt on in about two hours adding 4.8 inches to the overall length of a ‘73 car and 7.3 inches to pre-bumper era ’72 or earlier cars.

The G-nose reduces drag because of the extra length - it’s that much closer to a bullet shape - and also due to the fact that the grille opening is much tighter and the headlamp openings are sealed.

At 70 mph the gain in fuel economy (is) 1.2 mpg.

And there are other side benefits. The top speed on Ontario’s straight is up from 115 mph with the stock 240Z to 120 with the G-nose. And front end lift is less than stock by 95 pounds at 70 mph.

Unfortunately, the G-nose doesn’t come cheap. The complete package is available... for $635 with headlamp covers, or $475 without.
Note: the 5.5% fuel economy improvement cited in the thread title is my calc, based on C&D's measurement of the stock/base 240Z of 22 mpg (US) at 70 mph.

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

has launched a forum for the efficient new Mitsubishi Mirage - fuel efficiency info for Geo Metro owners - electric car conversion on a beer budget
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