Just as sure as your car needs to be tuned up, you need to be in tune with your car to optimize fuel economy. Your feet represent one (or two) of the most important touchpoints. Wearing the right footwear (or no footwear at all) can make a measurable difference in efficiency. When the summer rolls around, I often drive my own car barefoot. It’s a habit I picked up while growing up, and it’s never left me. Bare feet are a boon for light-footed driving.
Of course, it’s not always practical to drive barefoot. The mere thought repulses some people (particularly those with foot phobias or the dreaded fungus). The socially acceptable thing to do is to wear something on your feet. But it shouldn’t just be any something …
. Bamboo root barrier comes in a variety of widths and weights. The lighter the weight, the easier it is to make the bends. You won’t find it locally, though, and it tends to be expensive. Most folks use lawn edging like this 
. I’m not sure if this stuff is too heavy to make tight bends, but it looks similar to the material that Mighty Car Mods used in their recent D-I-Y Lip episode.