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I think you're a little confused.
a) lift makes for less traction. More speed = more lift = less traction at highway speeds = bad.
b) lift and downforce both create additional drag. You don't get something from nothing. (it is not equal, however, that depends on a lot of stuff)
c) more air under the car means more air along the turbulant underside
d) a wing in turbulance does nothing. Race cars try to smooth the air before their wing, or hang it up above the roofline for clean air.
Sorry if that sounded like grilling... I think you're just trying to stretch a concept a little too far. Yes, lower RR uses less gas, yes lift will lowing your RR, but it also affects other things... negatively.
Cheers!
Make a belly pan and lower your front bumper. You generate less lift, but you'll have less drag.
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