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Years ago I did a few mods to my 1999 1.0L Metro. Lower air dam under the front bumper and a belly pan hanging from the front stabilizer bar to the rear bumper. The belly pan was a bit of a challenge in that it had to be hung with brackets to lower it enough to clear the exhaust. I never really did any scientific types of testing but could safely say that these mods only provided about a 2% gain in MPG. So then I created a partial camback which resulted in over a 10% gain in MPG. I regret that I used fiberglass to attach it to the car, and now that I have removed it I have a mess to clean up. It sits parked now and I failed to crank and drive it often enough so now I've got to drop the tank and replace the fuel pump. My regular driver now is a 2000 Insight, a much more pleasurable car to drive. The Metro is a keeper though. No IMA to deal with, cheap parts available, and great MPG also. My Insight has 286K miles on it so no telling about how long it will last.
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