For more info see: ecomodder.com 15% better fuel economy at 90 km/h (56 mph). On-road yarn tuft testing and fuel economy testing of an aerodynamic “boat tail” mockup on the back of a 1998 Geo Metro (Pontiac Firefly) hatchback. The tapered form dramatically reduces drag and improves efficiency by minimizing the size of the car’s wake.
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{ 18 comments… read them below or add one }
is it really legal??
As AndY1ksi stated, the efficiency gain is actually greater at higher speeds if you consider the energy outputted. The motor, however, *might* be less efficient at 70 mph as opposed to 56 mph, but that will ultimately depend on your gearing.
@Yeltuh888
the reason fuel prices went up is because you guys are still buying them with your expensive bad for the environment cars. so blame yourselves.
Aaahahahaha!
))) THe ugliest aerodynamic body kit ever! 
)) No offence! Stop torturing poor Pontiac!! It’s not gonna save fuel while in traffic or when you drive in city 
)) The Hydrogen Booster Kit for the engine may do the trick. Anyway driving 56 mph (to save 15%) in 70mph speed zone doesnt sound like fun 
))))) КG/AM
very interesting experiment.
I think the tail has to be flat to the ground side though since you can’t suck in air from the ground. will only create a vacuum with turbulence.
plastic sheet cover under the car might also improve the drag.
what we really need though to really explore aerodynamics is a good freely available virtual vindtunnel software. they either suck or cost a trillion or only works under some obscure linux bullshit.
a windows application running on GPU. now!
@Yeltuh888 no fuel prices should go up and up. gas car has to go
generally speaking
or to myself..
Erhm… Who are you talking to when you say “bring down the fuel prices” ?
Excellent testing!
The fuel consumption difference would be even higher, at higher speeds.
The power to move (throttle) an object through the fluid (air) increases by the power of 3 in regards to speed.
The energy (consumption) required to move the object from A to B increases by the power of 2 in regards to speed.
You actually belive that shit Danich? You’re a fool.
I don’t wanna take off…
just drive forwards.. and just as spitfire1983 says (thank you btw) just fill it up! now bring down the damn fuelprices! please..
Nice for you that you established such a fuel reduction.
But I don’t give shit about fuel consumption, just fill it up and put the pedal to the metal.
Lower the a car about 1,5 inch and raise the tail a bit and hey presto! Another 10%!
Smile, je staat op Geenstijl!
this is butt ugly and un safe to drive. no state will allow it to pass safety inspection but it’s also worthless since the chevy volt gets the equivellent og 230 plus mpg and soon 300 to 400 mpg without the dorkmobile look
boeie
very cool man would like some music added even if it’s just the youtube supplied ones though.
Nice work, and lot’s of it. Inspirational. Can’t wait to see the final version.
O4b