The best tank of gas my 4-cylinder 5-speed Swift has gotten so far has been 42mpg, on average I'm getting about 38mpg since the temperature has dropped. I really want to get as close to 50mpg as I can so I thought it was time to start the aero mods.
I chose the lip spoiler first since it's probably the easiest to do. I bought some garden edging at Home Depot for 7.99 and riveted to the bumper. Took about 20 minutes total and was very easy to install. I would have done a partial grill block as well but I can't find black Coroplast locally. My Scangauge should be here today or tomorrow so I can start logging things to see if the mods are performing.
Check out the pictures, it really makes the car look a lot different and hopefully may return a .0005% increase in fuel economy
The stock bumper just sits far too high. Sorry for the iPhone pics.