Weight Reduction for better FE

[theholycow]

That's a mere 2.5% change in MPG (seems to be within a reasonable margin of error) for a whopping 19% change in weight. That surprises even me.

I know this sounds like approximately the same thing, but I'd really like to see the difference when a car designed to weigh X pounds has its weight reduced to X-Y pounds, rather than when its weight is increased to X+Z pounds. That's much more difficult to test, since significant weight reduction is so difficult.