[davelobi]

Maybe I'll get blasted for this but I actually found this humorous. In fact it fortifies the reason I push myself to get better and better mpg tanks, always trying to beat my personal best. It is almost a hobby.

Ok, I added an air-dam and lower grill block using garden edging. I already had it lying around form the last car I added it to but lets say I spent $20 for the edging and zip ties. How long would it take to show a positive return on investment?
Lets go with 45 mpg without it and gain 1/2 mpg with the air-dam for 45.5mpg.
1000 miles driven / 45 mpg = 22.222 gallons used
1000 miles driven / 45.5mpg=21.978 gallons used
22.222 - 21.978 = 0.244 gallons saved
$3.85/gallon x .244 gallons = 94 CENTS saved per 1000 miles driven. Wow, awesome.
After 20,000 miles I have almost got back my initial investment.
Even if it brings a 2 mpg gain that would still only save less than one gallon per 1000 miles driven, or about $55 per year (@15,000 miles).

Was it worth it? You bet. Every new mileage increase adds up and is fun for me. As an added bonus, the goofy looking air-dam gets people talking and thinking about their own driving habits.