[DrInnovation]

Reported differences in MPG (at gm-volt.com) are about 2-4 MPG in CS mode (i.e. using gas) and 3-4 miles of EV range. I'll keep my scrapers until they break off then decide.
Like the spring mounted idea of CarloSW2, but don't think that works well deep under the car (though maybe with a foward mounted dam and spring, so the air preasure pushes it down. When mine break I'm going to try that before going for $49 replacement shorter dams. Idea might be like this

BBumper--CCCCar
S\ /Dam
. \ /Dam
.. /Dam

GM has a patent on "flexible" (brush-like) dams. I've posted/wondered why they don't provide those an an option. With a stiff brush dam could get down to 2" clearance and still nor worry much a "scraping" -- heck it might clean off part of the driveway after a snow :-) I might try that too if the spring-dam does nto work well.


And FYI.. its not lawn edging, its recycled Gulf Oil Spill material. (Really!)