Caring about the weight of a windshield wiper on a car is a bit like caring about the weight of the pull tabs on your backpack. Maybe you removed all your pull tabs and use a paper clip you can switch between sliders :P. Anyway, there are lower hanging fruits out there.
1 mpg from no front wipers on a 27 mpg or so car seems a bit far fetched when compared with other aero mods and the results generally obtainned. I'm skeptical too, but i'd be willing to try it out.
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