Front air dam

Introduction
Extending a dam to the level of the lowest underbody component (possibly lower depending on the vehicle) diverts air away from (around) the most aerodynamically "dirty" area of most vehicles.

Adding air dams (particularly on trucks & SUV's) is a common tactic used by auto makers looking for quick aero-fixes to improve efficiency.

For cars that have a belly pan this mod is likely to cause no gain and may result in worse efficiency.

Instructions for mod

Screw a large piece of material to the front of the car. Ensure the bottom of the material is lower than the lowest object underneath the car this will cause most of the airflow to not be disturbed by the unaerodynamic underside of the car

User experiences

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User data
User Name	Car Make, Model, Year	Cost of Mod	Time to Perform Mod	MPG Before Mod	MPG After Mod	MPG improvement guess	Instruction Link
Big Dave	Ford F350 pickup			26.34 Tank fill measured	27.00 Tank fill measured	2.5% Tank fill measured	Effects of air dam (Ford F350)
kir_kenix	1997 Chevy S10	$5	15 Min	31ish	31.7	1% Tank fill measured	[]
moorecomp	99 Escort ZX2	$7	30 min			4.6% or 2MPG (tank to tank data)	Home Depot Air Dam
wagonman76	89 6000 LE Wagon	$0	<1 Hour			7% or 2MPG (several months of tank to tank data)	Lawn edging airdam still holding up well