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Originally Posted by aerohead
I GOOGLED an image of your car.It looks like Toyota has already covered the airdam issue.
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You mean a 2002 Corolla? No they don't have air dams. You may be looking at a more recent model. On 2002 Corolla the underparts hang at least an inch below the bumper.
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The nose of the car is virtually 'ideal' according to Hucho's metric.
There might be a little to be gained with some grille-blocking.
If only 20% of your driving is at 'speed',I'm not sure what aero mod returns on investment are going to be.
The US loses $75,000,000,000 a year on aero drag,but that's for actual highway driving.
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Is above for all vehicles or just cars/light trucks?