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Old 12-12-2014, 10:15 AM   #19 (permalink)
Master EcoModder
redneck's Avatar
Join Date: Jun 2009
Location: SC Lowcountry
Posts: 1,351

Geo XL1 - '94 Geo Metro
Team Metro
Boat tails and more mods
90 day: 72.22 mpg (US)

Big, Bad & Flat - '01 Dodge Ram 3500 SLT
Team Cummins
90 day: 21.13 mpg (US)
Thanks: 181
Thanked 1,111 Times in 536 Posts

Don't worry about aero, put a barn-door style air dam on the front like the Bonneville cars, block off and seal up as much of the font end as you can while maintaing cooling ability and start plowing some air!

A tastefully done air dam would not take away from the classic look. The grill and other areas can be blocked from the backside with various materials (coroplast, aluminum, plastic, weather stripping) and not affect the classic look.

I had a 1989 Buick Electra Park Avenue Sedan with a 3.8 that was rated at 19/28 mpg (U.S). With a little more air in the tires it would regularly get 30-31 mpg on a trip at 60-70 mph with no aero improvements. It weighed 3,350 lbs.

I think your goal is achievable with some driving adjustments and a scangauge or ultragauge to see what works and what doesn't.

However, what I haven't seen listed is what rear end ratio the car has, and what size tires are you planning on using. (Important stuff)

Cool project...

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